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00:13
1
Q: update from 2.2.6 to 2.4 posible?

mr_typo3Is it possible updating our system which is now on 2.2.6 straight to version 2.4? Or is it advised / needed to upgrade in steps? Any recommended recent howto on this subject?

3
Q: XML, select several values

Michiel van MensI import a XML file, using: xmldatatest = Import["C:\\...\\...\\name.xml", {"XML", "XMLObject"}, "ReadDTD" -> False] The file looks like (in real, the file is much longer): > <?xml version="1.0" encoding="UTF-8"?> <TimeSeries > xmlns="http://www.wldelft.nl/fews/PI" > xmlns:xsi="http://www.w...

3
Q: NGINX: map and try_files not working

forkei am using nginx to detect webp support in browser: # Check if client is capable of handling webp map $http_accept $webp_suffix { default ""; "~*webp" ".webp"; } this code works ok and assign .webp to $webp_suffix when client support image/webp then few lines later i am using this ...

5
Q: Genitive without an article

Mario BedounI have encountered this sentence: Ich hatte trotz vieler Jahre Englischunterricht in der Schule Probleme mit der Sprache. I know this type of genitive, where the word doesn't have an article: Das ist die schönste Stadt Deutschlands. Now my question is, in the first sentence why isn't an "s" a...

6
Q: What is meant by a partial derivative of a ket?

GeorgeIn my QM book I often see partial derivatives mixed with kets, like $$ \frac{\partial}{\partial i} |\psi \rangle $$ where $i \in {x, y, z}$. Here I'm assuming that $| \psi \rangle \in \mathbb{C}^n$ for some arbitrary $n > 0$ (in particular $n$ can be much larger than 3). Question: What is a part...

2
Q: Are all homomorphic encryption schemes based on latticed-based schemes?

JimakosPALISADE offers a pool of Homomorphic Encryption schemes and it is stated that "PALISADE is a general lattice cryptography library ...". My question is rather simple: are all homomorphic encryption schemes based on lattice-based cryptography?

00:54
5
Q: Merfolk sword. Would it work?

ssfgOne of the biggest problems about writing merfolk warfare is related to weapons. You can not slash underwater without expending a lot of energy, stabbing is much easier. Water has more drag than air and makes the sword move slower. That’s why in my merfolk society, swords are very rare. Most merp...

CS
CS
01:16
2
Q: Why don't most elected officials assume office right after the election result is confirmed?

potatoguyIn most countries, there is usually a gap between election day and the time when the elected official assumes office. Example: In the United States, the President is elected in November but does not assume office until January. In Germany, the Bundestag is usually elected around September, but i...

01:35
2
Q: Why can't you use the same backing track for all modes of a scale?

THX1137I am seeing lots of statements online to guitarists that they should be careful to use the specific backing track for a mode. It seems to me that you should be able to use one backing track for all modes of a given scale as long as it's compatible with the parent scale for those modes (by 'parent...

01:55
2
Q: Why isn't "giraves" the plural of "giraffe" like "wolves" is for "wolf"?

SphinxI'm quite confident in asking this question because there is no duplicate of this question on this site and I didn't find on the internet either. The plural of giraffe, according to Merriam Webster and some other dictionaries I checked, is "giraffes". Normally when the final sound of an English w...

02:10
3
Q: Rocket specifications: specific impulse, thrust to wieght ratio and burn time

Fredrik YgemanIn my somewhat unrealistic schoolproject regarding space tourism to Mars we have to accellerate a 500 ton module (mass of propellant and engines not included) from LEO to an orbit around the sun at Mars' distance. We have to transport all the fuel and propellants to the module ourselves. When cho...

02:22
9
Q: Example of a PID with a residue field of finite characteristic and a residue field of characteristic 0?

Tim CampionI understand that for any nonempty set $S$ of characteristics, there exists a PID $R$ such that the set of characteristics of residue fields of $R$ (i.e. quotients by of $R$ by maximal ideals -- I'm not including the residue field at the generic point. Thanks to Steven Landsburg for pointing out ...

3
Q: CBM PET 2001 garbled screen

Bartek MalyszI picked up this PET and trying to restore it. Screen is garbeled on boot and stays like that displaying random chars, some of them flashing. Tried to resocket the chips, but it didn't help. I don't have a logic analyzer, and ram chips are not socketed. What sort of checks I can I do to identify ...

02:42
5
Q: What counts as an ACOG Scope?

hammythepigIn season 6, the third Officer Challenge requires getting 40 longshot kills with an ACOG scope. Acog Longshots: Get 40 Longshot Kills while using an Acog Optic (6,000 XP) I looked quickly through some ARs and I can't find any scopes that had the letters ACOG, and searching it online brought me ...

8
Q: Very particular kind of 4-manifolds. Classification

GSMLet M be a smooth orientable compact connected (with boundary) manifold of dimension 4. In addition M is assumed to be aspherical and acyclic. question: is there a "classification" of such manifolds? Or can they be classified in any effective way?

GIS
GIS
2
Q: st_crop() follow latitudinal circle on polar projection

JepsonNomadI am generating a polar projection with the rnaturalearth::ne_countries() dataset. Because I'm only interested in high-latitude regions, I want to crop the shape above a particular latitude. However, when I crop, transform, and plot, the southernmost extent of each country that remains in the dat...

1
Q: Evidence that ø and œ are separate phonemes in French?

ThemeAre there any minimal pairs between ø and œ or other evidence that these are separate phonemes? I have been studying French, and so far it seems like ø is found in open syllables and œ is found in closed syllables. Wikipedia counts them as separate phonemes: https://en.wikipedia.org/wiki/French_...

1
Q: What is the cause of discrete spectra in quantum mechanics? Both compact Lie groups and bounded Hamiltonians?

ziggurismWhat is the mathematical cause of the "quantum" in quantum mechanics? What causes some observables to take on discrete values? There seem to be two different causes, compactness of symmetry Lie groups, and bound states. I haven't been able to find a full explanation of either cause, and am also w...

03:18
4
Q: Uniformly approximating a function and its derivative using polynomials

mw19930312I'm struggling either proving or disproving the following statement: Let $K\subset \mathbb{R}$ be compact, and $S = \mathrm{span}\{p_k, k = 0, 1, \ldots\}$, where $p_k$'s are polynomials over $K$. If $S$ is dense in $C^1(K)$ with respect to sup-norm, then for any $f\in C^1(K)$, there exists $\{g...

5
Q: First Changes of Sign in a List

Jonathan KinlayI asked a similar question previously (https://bit.ly/3llhmFE). This one is similar, but different. I have a list comprising a sequence of digits 1, 0 and -1, for example: l = {0, 0, 1, 1, 1, 1, -1, -1, -1, 0 , 1, 1} I want a function to return the result: {0, 0, 1, 0, 0, 0, -1, 0 , 0, 0, ...

03:32
2
Q: Unix Epoch in International Space Station

exifguyThe International Space Station is in a different gravitational field than us on the earth's surface. Almost all computers / protocols depend on the unix epoch being consistent everywhere. The unix epoch is same for all computers on the earth's surface, since they are in the same gravitational fi...

3
Q: Can Chasers just fly through Quidditch hoops while holding the Quaffle in order to score?

TylerHIn Harry Potter, Quidditch matches involve Chasers attempting to score 10 points at a time by throwing the Quaffle through one of the three hoops at the appropriate end of the Quidditch pitch. Said three hoops appear to be quite large... large enough for a human to fly through: Is it legal for a...

1
Q: How do I request currently unavailable options to be sold?

NNOX AppsHow can I request options: for a certain stock that currently has no options traded? at a more extreme Strike Price? E.g. if I fancy buying OTM options? with a farther expiration? Does the CBOE have a specific email or online form for requesting options?

03:57
5
Q: Do I need CW or CCW props for my plane?

Ceramicmrno0bYet another question, sorry, this one should be quick. So I'm making an airplane with a motor at the front, do I use CW or CCW props? Pretty sure this is what counts as a puller plane(is that the right term?).

04:11
1
Q: Plot mean of data with error bar

IndeterminateSuppose I have the following data with co-ordinates: {{1,190},{1,200},{1,210},{1,180},{1.5,175},{1.5,200},{1.5,190},{2,100},{2,150}} How do I make a listplot of this data set, by taking the mean of the y-values for a particular x-value and then plotting an error bar. Since this is a small data se...

1
Q: Only allow one Checkbox to be Selected In LWC

Brooks JohnsonI know radio buttons are ideal for this but everyone wants checkboxes. In this case I have two checkboxes in my markup and if one is selected I want to make sure the other is not. The code in my JS below seems to be doing what I want. At least from the console. But the view is not getting updat...

1
Q: Is it unethical to "mislead" partner if s/he is the weakest player at the table?

Tom AuNormally (on defense), you try to play in a way to reasonably "signal" and inform partner of your holdings. But suppose partner is the weakest player at the table, and is unlikely to read your signals. So you shift gears and play to mislead declarer, instead. On the other hand, if declarer were y...

Ham
Ham
1
Q: What are the properties of the radiation of a magnetron?

HolgerFiedlerIt is commonly known that electromagnetic radiation from an antenna is polarized; the electric field is parallel to the rod and the magnetic component is perpendicular to it. What does the radiation of a magnetron look like? Is this radiation polarized, is it continuously or periodically declinin...

04:29
3
Q: python hangman solver

tibiI wrote a program that read a csv file that contain 100 rows that look like: 1;S****L;SCHOOL 2;*A*G*A*;HANGMAN then try to guess the letters like in a hangman game. My scope is to count every right and wrong letters and then sum them up. The code works fine, I get around 1670 right + wrong attem...

RPG
RPG
7
Q: Roleplay pacing in non-combat situations

Rafael LambelinSo I am running the Baldur's gate: Descent into Avernus module and my players are taking very long to approach certain situations. To set an example: There is a gate with two guards who are checking everyone who passes through. They need to get inside (because of their own choosing and also their...

CS
CS
04:45
4
Q: Is this MOSFET upside down?

ThatKeffordGuyI'm looking at existing circuits and trying to understand them so I can design my own. Also to improve my electronics knowledge, for some reason MOSFETs have never quite sunk in for me. I came across the circuit for this board (the files from here (Rev D)) which the company are gracious enough to...

2
Q: Was Donald Trump treated with pharmaceuticals derived from fetal stem cells?

PhoenixA post on www.twitter.com [link] has garnered over 100K retweets and 345K likes which states: So it turns out the monoclonal antibodies that Trump is on are from fetal stem cells. So Trump is being treated/saved with dead babies. Republicans? Amy Barrett? Pro-lifers? Anybody? The implied releva...

05:05
9
Q: Why can't I declare a concept at class scope?

HolyBlackCatConsider this code: struct A { template <typename T> concept foo = true; }; It doesn't compile. My Clang 10 gives me error: concept declarations may only appear in global or namespace scope, and GCC says something similar. Is there a reason why it's not allowed? I don't see why it couldn...

05:45
1
Q: Why screenshot is 截圖, not 屏幕 圖?

Nai Why wasn't screenshot translated as 屏幕 圖? Isn't 截 inaccurate? I screen shot (coincidence!) 截 on CUHK. Here I 截 the Web page to screen shot just the English meanings, but screenshots can be NOT 截. I can screen shot whole screen.

05:56
7
Q: Passing int as bool argument in C++

Sergecould someone explain what happens in this code: example here: https://ideone.com/1cFb4N #include <iostream> using namespace std; class toto { public: bool b; toto(bool x) { cout<< "constructor bool:" << (x ? "true": "false")<<endl; b = x; } ~toto() {} }; in...

06:27
2
Q: Do I need to pay taxes as a food delivery worker if I make less than $12,000 in a year?

deliveryguyI started working for Doordash, a food delivery service. Technically I think I am a self-employed contractor. I saw online that you don't have to declare taxes if you make less than $12,200 in a year. However I also read that you're supposed to declare taxes if you make more than $400 as a self-e...

06:47
4
Q: Non-values of $a^3 + b^{c^3} - 3 a b c$ for $a,b,c\in\mathbb{N}$ like $n$ for prime $19n+17$?

David CallanI stumbled on a curious case of Richard Guy's Strong Law of Small Numbers because of a typographical error. I intended to type a^3 + b^3 + c^3 - 3 a b c and look at its values (Problem A1 on the 2019 Putnam Exam), but I omitted the exponent on $b$ and it came out as a^3 + b^+c^3 - 3 a b c. Mathem...

07:01
1
Q: Who were "The Primitives"?

Asteroids With Wings Supernatural divinities are the primitives' answer for why the sun goes down at night. [Brother Cavil (Lay Down Your Burdens, Part 2)] Now, don't get me wrong, we can deduce roughly what Cavil was talking about: "lowers" with less knowledge and/or intelligence who lacked a scientific background...

07:11
2
Q: Meaningful way of "I love my children, who are no longer with me"

Jamie LindseyNot being able to speak Latin I really cannot find a way to say this that I think is satisfactory. I would like to portray this in the sense of my own children that are alive but not with me. In a way that represents the fact we will be together again in the future and until then I think of them ...

TeX
TeX
07:21
1
Q: Mixing itemized and enumerate list items?

David GivenI have a situation where I need to generate lists which contain a mix of numbered items and non-numbered items. Only the numbered items increment the counter. So something like this: I know how to suppress the bullet by using \item[], but it looks like whether an item is numbered (and increments...

1
Q: Why would the digits fade out and blink in darkness on a KX-155?

2NinerRomeoI have a radio installation with two KX-155 Nav-Comms. These radios are equipped with a photocell to automatically dim the displays to match cabin lighting. In dark lighting, the digits fade to the point of unreadability, with some segments being visible and some not. I can brighten and read t...

3
Q: Is there a way to combine colors in blender?

TejasSuch that, using nodes, we could dynamically combine the hue, saturation and value to two given colors. Example : Red + Blue = Purple / Violet Green + Black = Dark Green Basically, this is my node setup. Running the noise texture through a color ramp gives me random noise of varying size in the ...

07:39
1
Q: In a remote shell, how can I find out from which computer I logged into the remote machine?

halloleoIn a remote shell, how can I find the domain name of the computer from which I logged into the remote machine? Example: My local machine is mi.pona.com. On this machine I run ssh [email protected] to login into the remote machine sina.pona.com. In the shell which opens (running on the remote m...

DBA
DBA
07:53
1
Q: Is left hash join always better than left outer join?

mergerI have a query that runs quite slow (see below). While searching for a way to improve it we found that the query runs about ten times faster if we replaced the LEFT OUTER JOIN with LEFT HASH JOIN The result seems to be the same. Is it? In what cases wont it return the same result? What difference...

8
Q: Trichain: Introduction

BubblerNext: Trichain: Going Higher Trichain is a new puzzle type I invented. It is somewhat similar to Nurikabe, but it uses a chain of L-trominoes instead of a continuous wall. Example puzzle with solution: Rules: Numbers must be white, and match the size of their white islands. Each white island ...

08:42
9
Q: SciFi book: Earth split between Ant-Bee-Wasp alliance and The Rats

AndysaurusMany years from now, the Earth and Moon have been clobered by a massive cosmic strike. Humans have survived for centuries in underground hibernation chambers. When they emerge, they find that the Earth is split betweeen the Ant + Bee + Wasp alliance and The Rats. Under the surviving Prime Coordin...

08:53
1
Q: Closed/Exact Forms and Complex Functions

user193319If $f : D \to \Bbb{C}$ is a function, where $D$ is simply connected, what does it mean to say that $f(z)dz$ is either closed or exact? I know what it means for $Pdx + Qdy$ to be exact or closed when everything is real, but what happens when you move over to $\Bbb{C}$?

3
Q: Does speed of light being constant make time a derived unit?

gcrThis is a paradox I'm trying to understand. I'm not tackling relativity yet. I'm still working through Walter Lewin's lectures on electro magnetism. However, I understand base and derived units pretty well and in preparation, there's something that's picking on me. Consider distance (aka length, ...

09:11
9
Q: Tetromino minesweeper: the Amphitheater

bobbleThis is a minesweeper puzzle with a tetromino twist. The goal is to place mines in the grid, following a few constraints. Rules: A number indicates how many adjacent (including diagonally adjacent) cells have mines in them. Mines cannot go in numbered cells. Mines must be grouped into tetromino ...

CS
CS
09:24
5
Q: What is the point in yard signs in presidential elections?

Ryan_LI just don't see that there is any possible benefit, in the case of presidential elections anyways. I don't think there are many, if any, registered voters who haven't heard of Donald Trump or Joe Biden, so the goal can't be to raise awareness. No need to raise awareness of something everyone i...

GIS
GIS
09:42
2
Q: Merging touching lines in QGIS

Clinton WebbI have a vector layer, in which structures (pipes under roads) are made up of multiple lines. I wish to spatially join all the lines that make up a single structure, but cannot figure out a way to do this. I've been messing around with things like "dissolve", but that merges all lines in the laye...

10:00
3
Q: What does VSP mean in the book The Original Scots Colonists of Early America, 1612-1783?

WilliamKFIn the book ''The Original Scots Colonists of Early America, 1612-1783'' by David Dobson, published in Baltimore by the Genealogical Publishing Co. in 1984, I find on page 349 it lists an entry for James Wood that reads: Wood, James, Jacobite, tr. 29 June 1716, fr. Liverpool to Jamaica or Va, i...

10:50
1
Q: Can に be translated to "be"?

MaiyahI've been trying to learn Japanese for a little over a month now which let me finally read this little tag line on a My Hero Academia poster I have 「最高のヒーローに」 Once I looked up the meaning of each Kanji I gathered that is meant something along the lines of "the best of heroes" or just "the best hero.

3
Q: How to use other methods to realize `Differences`

A little mouse on the pampasI know the following method can get the desired result {b-a,c-b,d-c,e-d}: Differences[{a, b, c, d, e}] But I want to know more about how to do this. MovingMap[Subtract, {a, b, c, d, e}, 1] Please provide as many methods as possible.

2
Q: /proc/[pid]/fd/[0, 1, 2]: No such file or device - even though file exists

Jacob SchneiderI'm trying to access a process' stdio streams from outside its parent process. I've found the /proc/[pid]/fd directory, but when I try $ cat /proc/[pid]/fd/1 I get a No such file or device error. I know for certain that it exists, as Dolphin (file explorer) shows it. I also happened to notice th...

11:06
2
Q: Can a reduction of employer taxation lead to more equal income?

EmmanuelMessIn Argentina, it's usually said that the economic burden on employers is very heavy (just an example). So much so that, if it were lifted, more people would become employed, but I don't quite understand how this would work. Employer taxation is one part of the problem, the other part is the "dedu...

11:25
4
Q: Translation of 1 John 5:16

DaveI have a question regarding the translation of 1 John 5:16. In the verses below, I have highlighted the translated (added?) words I’m querying. Why does the NIV use ’you’ where the NKJV uses ’he’? [and in the second highlighted word] Why/how is this taken/assumed to be referring to be ‘God’? 1 J...

4
Q: How can you conclude that gravity is a conservative force?

ROG NotesA force field $F_i(x)$ is conservative if for every curve $C$ from a point $y_1$ to a point $y_2$, we have $\int\limits_C F_i(x)\mathrm{d}x^i$, so that the energy difference between $y_1$ and $y_2$ is independent of the curve taken from one to the other. Equivalently, the integral around a closed...

11:44
9
Q: Trichain: Going Higher

BubblerPrevious: Trichain: Introduction Trichain is a new puzzle type I invented. It is somewhat similar to Nurikabe, but it uses a chain of L-trominoes instead of a continuous wall. Example puzzle with solution: Rules: Numbers must be white, and match the size of their white islands. Each white isl...

1
Q: Array Issue In Javascript

Krishna CasukhelaI have an javascript array in lightning component controller. var networkIds=[]; after some logic I have as follows inside the array "NetworkID":"11320" I want to extract the number "11320" and then store it in attribute of type string. I am doing as follows: var networkid=networkIds[0].split(...

2
Q: Are protons bigger than electrons

alienare 4422In every text/ physics book that I've read, Protons are mentioned as particles that are bigger, way bigger 2000 times to be precise, than electrons...I believed that until a few minutes ago when I googled "what is the radius of an electron" and then I read somewhere that it was 2.5 times bigger t...

1
Q: What happens to option contracts during a private buyout?

AlanSTACKLets say I have 100 $15 call contracts for NYSE: GPS (Gap Inc) that expires sometime next year. Hypothetically, if the company were to announce a leveraged private buyout of the remaining shares at $30/per share - what would happen to my call contracts? Would I get fairly compensated from my brok...

12:09
5
Q: Trichain: Three Times Ten

AviThis is a Trichain puzzle. The rules of Trichain are as follows: Numbers must be white, and match the size of their white islands. Each white island can only contain at most one number. Some white islands may have no numbers. Black squares must be part of L-trominoes. Black L-trominoes cannot b...

 
2 hours later…
13:53
1
Q: 있어 in the middle of a sentence

BugsyI found this sentence in my textbook: 마음에 드는 지갑이 있어 사려고 했는데 가격이 너무 비쌌다. and its translation should be roughly: I intended to buy my favorite wallet, but the price was to high. My question is: what does the 있어 do in the middle of the sentence? Could this be a mistake?

14:22
2
Q: Is it possible to play jazz on a cello?

iJaneSmithI'm writing articles for a website about music and musical instruments. Usually, our team writes about topics that have already been conceived. But sometimes we can suggest our own topics as well. I have an idea to write about jazz. It is a really huge topic, so I'm thinking about separating it i...

14:36
2
Q: Ethics of spending one's private time to work with unrelated projects

kube_userI was hired for my current job (in a very old industry) around 8 months ago specifically to modernize the company's tech stack and also to improve overall tech culture by introducing modern tech stack, development processes etc. based on my experience working with startups. Now, due to COVID-19 r...

3
Q: await user input with async/await syntax

gauguerillafor clarity: moved here from stackoverflow after being pointed to Code Review being the better place for this question I love async/await and Promises since I got my hands on them. And I might be overdoing it, but it feels like there should be a good and readable way to utilize async/await to get...

2
Q: Can I fly to New York from abroad, stay 4 days, and then leave abroad?

DanielI have a flight from South America to NY on Friday, I planned to stay there for 5 days or so and then I leave to Denmark. However, I just learned about the 14-days quarantine restrictions that are in place. Do you think I may not be allowed to fly out on the specified date?

CS
CS
14:53
1
Q: Succesful hostage situation?

Yağız Alp ErsoyOur media, no matter which country you live in, is always telling us that hostage taking terorrist can't reach their objective and they will fail. Iranian Embassy Siege failed to reach it's objective, I always and always hear US soldiers saying that hostage takers deserve to die. In Hollywood mov...

2
Q: Would a giant atlatl be a viable siege engine?

KeizerHarmI want to explore an advanced Native American civilisation; assume their general 'technology level' is 'equivalent' to 13th-century Europe. Biggest difference is that their metallurgy is lagging behind; this country is only just starting to make use of iron for instruments larger than tuning fork...

5
Q: How does tankage mass really scale?

SE - stop firing the good guysA problem that frequently shows up is estimating the mass of the propellant tanks of some hypothetical rocket configuration. This need arises from the important role of the dry mass in a rather famous equation. Two assumptions that are often made: Tankage mass is proportional to propellant mass. ("

15:17
2
Q: Repentance or atonement for killing a cow or eating beef

Severus SnapeSome observations: In a particular society in India, the repentance for consuming beef is that the "sinner" must put on the rope around his/her neck (i.e. the rope wound around a cow's neck) and go for begging by "mooing". Another tribal Hindu society requires providing feast to the society (or...

15:34
4
Q: Arbitrary torsion in cohomology of Kähler manifolds

Joe TFix an integer $i\geq 3$ and a finite abelian group $G$. Is there a connected closed Kähler manifold $M$ such that $H^i(M, \mathbb{Z})\approx \mathbb{Z}^n\oplus G$ for some integer $n\geq 0$?

1
Q: connect two routers with different subnet

JoBeI've seen a lot of questions about this, but haven't really understood/didn't match my issue. I'm a newbie regarding networking. I got two routers, both are connecting to the wan (giving them different external IP). 192.168.0.1 is a vilfo and 192.168.2.1 is a dlink860l is there anyway to connect ...

2
Q: A box contains 7 white and 5 black balls.

Ankita PalA box contains 7 white and 5 black balls. If 3 balls are drawn simultaneously at random, what is the probability that they are not all of the same colour? Calculate the probability of the same event for the case where the balls are drawn in succession with replacement between drawings. Probabilit...

6
Q: C++20 concept syntax - what does the requires parameter variables mean?

RnMssMany articles give examples like this: template<typename T> concept Equal = requires(T a, T b) { { a == b } -> std::same_as<bool>; }; Does it make any difference if I write: template<typename T> concept Equal = requires(T a) { { a == a } -> std::same_as<bool>; }; If it doesn't, why was ...

1
Q: How does having a large diameter make the SEL85F1.4 a premium lens?

LokeshI have been reading about Focal length and Fast lenses when I came across this lens which has 85mm focal length and F1.4 as FStop. https://www.sony.co.in/electronics/camera-lenses/sel85f14gm Generally lenses with 1.4mm Fstop have focal length below 35mm but here its 85mm!! As we calculate FStop a...

15:57
5
Q: Who commit the murder?

WanAmong six suspects (C, D, G, H, J, T), two worked together to commit a murder. H said C and G did it. J said D and T did it. D said T and C did it. G said H and C did it. C said D and J did it. T refused to say anything. Four of the five suspects that said anything named one person correc...

3
Q: Mounting the front light on the frame instead of the fork or the handlebar?

WhatHiFiI've had my front light mounted on the handlebar for the last 4 years or so. I never liked the bulky look and more importantly, how it jumps around in a response to my handlebar movements (if I'm on a rocky road avoiding obstacles and people are walking in front of me, it unnecessarily scares the...

4
Q: How do I bulkify queries for directly or indirectly related records?

Phil WThis is a canonical question and answer developed by the community to help address common questions. If you've been directed here, or your question has been closed as a duplicate, please look through the resources here and use them to shape more specific questions. To browse all canonical questio...

16:12
2
Q: How does decision tree minimize error on unseen data?

SolThe goal of a classifier is to minimize the Error (($F(x)$ - $\hat{F}(x)$)2), where $F(x)$ is unknown function of $x$ and $\hat{F}(x)$ is the predicted function. My question is: if we don't know $F(x)$ for unseen data, how does a decision tree minimize this error? Why do we estimate the error for...

7
Q: How far could civilisation develop within one lifetime - starting from nothing?

fgysin reinstate MonicaThis question here asked if it would be possible to reach the moon within a lifetime for a civilisation starting with "nothing". The answer to that question, quite clearly, is: no way. But it made me think. Given a similar basic experimental setup, how far could a civilisation actually progress w...

2
Q: Convert bash script to a compiled standalone binary executable, not text

Mihir AI want to make a Bash script executable by the kernel. I have already used the chmod +x command and #!/bin/bash to make it executable and it works, but that I want to do is make it an executable without an interpreter, like an executable from a compiled app. Is there any way I can do this? All I ...

16:30
3
Q: Do these triangles with parallel hypotenuses?

ValiantThis originated as a question that I encountered while woodworking, but nerdy me had to try and see if there was a solution. Say I have two right triangles, and each of them have the same angles, but one is slightly larger than the other (with the right angle for both at the origin). Arranging ...

1
Q: How does Stockfish know if the king is in check?

fartgeekI am writing a chess engine. I need to know how to tell if the king is in check. I was thinking that maybe I can use the approach that Stockfish uses. Where and how in Stockfish's code is check detected?

16:47
1
Q: Is there a "latch" node in animation nodes?

user2824371I need a Boolean node that does the following. If the input is true at any time, the output becomes true and stays true. Even if the input is removed or becomes false, the output must stay true. It's like detecting a pulse or touching a button then walking away and the bulb doesn't turn off when ...

1
Q: Time dependent Schrödinger equation in 2D

VefhugI have the following Schrödinger equation in $2D$: \begin{cases} \partial_t \Psi(x,t) = V(x,t) \Psi(x,t) \quad x \in [-10,10]^2\\ \Psi(x,0)=\exp( \frac{1}{2} (-x^2+y^2)) \end{cases} where the potential $V(x,t)=\mathbb{i} \Bigl( \frac{1}{2} \Delta - (x^2+y^2) - \sin^2(t) (x+y) \Bigr)$ with homogen...

3
Q: Can MAE be reported in percentage?

towi_parallelismIn Wang et al. "Predicting New Workload or CPU Performance by Analyzing Public Datasets" (2019), the MAE is measured in a standardized space (Mean=0, SD=1). This is discussed in 3.4 Metrics, page 9. Then right after Figure 6 on page 12, all the MAE references in the paper are presented in percent...

CS
CS
4
Q: Why don't profitable firms use previous profits to offset current loss

RedBaronIt is being reported that EasyJet expects a heavy loss in the current year due to Covid-19 pandemic. The report states that The airline said it expected to sink into a pre-tax loss of between £815m and £845m in the current financial year, which is worse than analysts' forecasts of a £794m loss. ...

17:15
4
Q: Algebra with a certain abelian group as the multiplicative group

M masaLet $A$ be an abelian group. Are there an algebra $\mathfrak{X}(A)$ s.t. the multiplication group is isomorphic to A ? i.e. $$ \mathfrak{X}(A)^{\times} \simeq A. $$ For example, for $A=\mathbb{Z}/4\mathbb{Z}$, $\mathfrak{X}(A)=\mathbb{F}_{5}$. I want to know the sufficient conditions of $A$ for e...

1
Q: What's the term for finding an attestation of a word that predates the earliest known one?

PsychonautCertain dictionaries make a point of citing the earliest known written usage of a particular word. Sometimes, after the dictionary is published, someone tracks down an even earlier attestation of the word (which may end up getting cited in the next edition of the dictionary). I seem to recall re...

ELL
ELL
17:40
4
Q: "Enter string theory to rectify the problem." Where is the subject of the sentence?

Charlie Wang The standard model, however, failed to explain gravity. Enter string theory to rectify the problem. (From an ACT test) As the bold sentence above, it throws me off when I see a verb lead a sentence: where is the subject?

18:09
2
Q: Formatting a number as text & adding a string

AlexNot sure if I should post this here or in Stackoverflow since I'm doing something in VBA, but the formula I want to use is just basic Excel: Example I have a number in one of my cells: 1741579193,58 (for English speakers it would probably show (1741579193.58) I want the following format: 1.741.57...

6
Q: How can induction work on non-standard natural numbers?

M. WinterWhen we consider the Peano axioms minus the induction scheme, we can have strange, but still quite understandable models in which there are "parallel strands" of numbers, as I imagine in the picture below: $\quad\quad\quad$ This mental image makes it at least plausible that induction might not wo...

18:24
1
Q: What does the autopilot do if activated in a stall condition?

CloudI was thinking about Air France 447 recently and had a wonder: What would happen if the pilots had re-engaged the autopilot and stopped all stick input? (If that's even possible in a stall condition). I know this has since changed, there is the MCAS system now, which will force a stall recovery. ...

1
Q: What is the location of this pic?

Michaela Can someone help find out what is the location of this picture? I tried enabling the ''Tips'' option for the Windows Lock-screen but it still does not work. Thanks, Michaela

1
Q: Localization inside shortcode not working

user2516117I use a shortcode that retrieves the url of woocommerce products and builds a link: function woo_url_shortcode( $atts ) { $atts = shortcode_atts( array( 'id' => null, ), $atts, 'bartag' ); $html = ''; if( intval( $atts['id'] ) > 0 && function_exists( 'wc_get_product' ) ) {...

18:43
2
Q: Someone claiming to be from my phone provider called asking me to add money to my account. Is this a scam?

Deepak M SSomeone called me to ask whether I have recharged (added money to) my mobile account. He told me that he was calling from the network provider and wanted to assist me with the recharge. Unlike an automated call that I usually get, this was an actual person who was calling, and I had not even cont...

18:58
4
Q: Creating hexagonal grid (hexagonal grid graph)

azerbajdzanIs there a function that can create hexagonal grid? We have square grid graph, where we can specify m*n dimensions: GridGraph[{m, n}] We have triangular grid graph (which works only for argument n up to 10 - for unknown reason): GraphData[{"TriangularGrid", n}, "Graph"] I can not find a functio...

Vi
Vi
1
Q: Is it possible to list only my marks

Salahuddin AhmedWhen I run :marks it lists all the marks including the standard vim marks. This is somehow distracting. Is there a way to list only my marks that I created using m-X for example?

TeX
TeX
5
Q: Why is `\restriction` a relation-symbol?

user21820I do not understand why \restriction (from package amssymb) is defined to be a relation-symbol. It is certainly not one in mathematics... Is there any special reason, or should I just consider it a bug and redefine it using \mathbin?

19:46
7
Q: Nutakapa: A Nurikabe-Tapa Hybrid

Jeremy DoverNurikabe and Tapa puzzles have the interesting property that the target shading is identical for both: a fully-connected shaded region with no 2-by-2 blocks. The difference is the cluing, so there seems no reason you can't use both Nurikabe and Tapa clues in a single grid to clue a single shaded ...

1
Q: Why doesn't ^s$ in regex match a string like "starts with s and ends with s"?

Asker321If ^ matches the beginning of a line and $ matches the end of a line, then why doesn't ^$ match the beginning AND end of a string like the one in the title? How do you make such a regex that matches a string like this: starts with s and ends with s

7
Q: Why are DFT simulations/calculations called First Principles Structural calculations? What is 'First Principles'?

Shubham AgarwalA newcomer to density functional theory calculations is exposed to jargon which sounds rather non-technical at first. For instance, 'charge density' is something that is actually a term in the formalism, whereas terms like 'ab initio' and 'first principles' seem adjectival. Please help me underst...

20:13
1
Q: Understand Hexabromocyclododecane CAS numbers

andscharHexabromocyclododecane has 16 possible stereo-isomers. So far so good. I found that: 134237-50-6 is the CAS of alpha-Hexabromocyclododecan 134237-51-7 is the CAS of beta-Hexabromocyclododecan 134237-52-8 is the CAS of gamma-Hexabromocyclododecan 3194-55-6 is the CAS of a mixture of different ...

20:41
2
Q: Is there any fix or workaround for Gack with Error ID: 622456132-619398 (-1311433241) related to `SurveyInvitation` object?

p-pI have very simple LWC inside Community page. Inside the page I have the following query, which seems to raise Internal Salesforce Error, but I don't understand why This is the query SELECT Survey.Name, CommunityId, CustomField1__c, CustomField2__c, InvitationLink, LastModifiedDat FROM SurveyInvi...

21:09
2
Q: (John 3:16) Greek: Only Begotten

Gus L. John 3:16, “For God so loved the world that he gave his only (μονογενῆ) Son, so that everyone who believes in him may not perish but may have eternal life." My question resides in the greek term μονογενῆ often translated a only or "only begotten" and which seems to be a significant part of Chri...

1
Q: Should I apply to schools I am not sure I would attend?

JaglokI graduated 2 years ago. I am now seeking to apply to a Master’s degree in Finance. I am currently applying to 6 universities. My letters of recommendation are from renowned professors who are really putting time and effort to ensure i get approved in a top program. The thing is I currently have ...

6
Q: Is it possible that "hard mathematical problems" would be easier in some other axiom systems?

mavaviljIs it possible that "hard mathematical problems" would be easier in some other axiom systems? Does this make any sense? I was motivated by this question after reading some paper that concerned how the choice of axiom system affects "attainable truths". Thus while some questions may be unanswerabl...

21:20
1
Q: Does the first TCP FIN packet (active close) goes with just only FIN bit set?

budoattackSuppose we have established TCP connection. The active close process assumes the FIN packet been sent to trigger TCP connection closing. But I can't figure out, is this first (active close) FIN packet has only FIN bit set? Or there can be ACK bit or even PSH with some data payload? Thanks in adva...

ELL
ELL
1
Q: Is ball-park figure formal or informal?

a.torabyIs it OK to use this expression in an academic text? The given charts represent ball-park figures of mortality rates in European countries. Is ball-park formal enough to be used in an academic context?

21:39
1
Q: Best practice for invoicing when working onsite

PelMost of the freelance projects I take on involve working remotely, for a fixed price. I'll then take a deposit before starting work and invoice for the rest on completion. However on occasion I find myself working at clients' offices for a day rate and I find billing a little more tricky. In the ...

CS
CS
2
Q: Can Quasi-Linear functions be monotonic?

Steve JoshI want to ask that Can Quasi-Linear utility functions satisfy the more is better (monotonicity) assumption?

4
Q: Parity attack on block cipher

killertogeMy misunderstanding is all about the parity attack mentioned in "Cryptography Engineering by Ferguson, Schneier and Kohno". Most modern block ciphers have a 128-bit block size, but they operate on 32-bit words. They build the encryption function from many 32-bit operations.This has proved to be ...

TeX
TeX
3
Q: How to make a superscript of arbitrary width?

Alberto BragagnoloI'm trying to make the following two commands of the same width: \newcommand{\Bsh}{\ensuremath{B^{H}_{s}}\xspace} \newcommand{\Bsl}{\ensuremath{B^{L}_{s}}\xspace} in order to avoid these ugly alignment issues: I have tried without any success to use a combination of \smash, \llap, \rlap, \clap,...

1
Q: toggle hide/unhide parent and children objects at once similarly to the outliner Shift+LMB function

ttsesmIs it possible to simulate the Shift+LMB for hiding a parent object with its children as in the outliner. Now based on this and this I am iterating over the children objects and hide_set(True) them individually: def toggle_hide (list, mode=True): children_list = [] for obj in list: ...

ELL
ELL
21:54
1
Q: Is there a noun for a man who wrote a best-seller book?

JKHAIs there a noun for a man who wrote a best-seller book? Or shall we describe by "this man who wrote a best-seller book"?

6
Q: Maximal in-degree in directed voting graph

Dominic van der ZypenReal-life motivation. Our team has $n$ members. For the next in-team presentation session, everyone had 1 talk prepared that he or she would be able to present. Now everyone could cast $1$ vote about whose talk they would like to hear. (Everyone is modest, so no-one voted for their own talk.) Now...

DIY
DIY
22:12
2
Q: Does tar roof patch on EDPM rubber roof cause damage?

DannyI applied Henry 208 roof patch on my EDPM rubber roof. It looks fine and seems to be holding up, however I'm concerned that it may react with the EDPM chemicals. I have heard this can happen with certain materials, and I'm wondering if I should cut out the patches I did (1x1 foot or so...8 of the...

3
Q: Was Eddie Van Halen's tongue cancer caused by metal guitar picks?

ewancEddie Van Halen was diagnosed with tongue cancer in 2000. He attributed the cancer to his habit of holding metal guitar picks, made from brass and copper, in his mouth. He was declared cancer-free in 2002 but then was later diagnosed with throat cancer from which he eventually died on Tuesday (Oc...

Ham
Ham
22:42
1
Q: Broadcast signal deviating with time

directeditionI've been just scanning through the HF band at night seeing what all I can pick up, and I'm trying to figure out a particular signal. I'm using a VHF discone, which isn't ideal, but it works well enough for simple reception with an RTL-SDR. 22.695mhz. When I tune in the evening (roughly midnight ...

TeX
TeX
22:53
2
Q: Drawing Topological Diagrams

Micho1921I am taking a course on point set topology so since I take my lecture notes using LaTeX I want a software or application from which I can sets and topological diagrams and import them to LaTeX. For example, how could I create a set like this one using some software online.

2
Q: EC/261 eligibility for a multi-flight itinerary only partly in the EU

lambshaanxyA followup to this question: I have booked an itinerary on Turkish Airways travelling from outside the EU to the EU via Istanbul, consisting of four flights, all on the same PNR. Asia-IST IST-EU EU-IST IST-Asia If I'm parsing my Air passenger rights page right, since TK is a non-EU carrier, the...

23:11
2
Q: How can a cross-level interaction be random in a 2-level mixed-model?

rnorouzianI was wondering why m below is a legitimate model? If it is, what is the meaning of its random part? ses is a level-1 predictor and sector a level-2 predictor making their combinations a cross-level interaction. In other words, I'm asking how a cross-level interaction can be taken to be random in...

23:26
5
Q: Book where aliens live in an ocean contained in a special camp

FionaI read this book a while ago and I forgot the name. The cover has a big Ferris wheel on it. The main character is a girl and she lives in a small apartment thing with her mom and her dad and basically there are these aliens that live in the ocean contained in a special camp. Then for some reason ...

23:38
1
Q: How many threads in the 'Tzitzit' of Karaites?

The GlacierAccording to the rabbinical tradition, there are 8 threads in each side of the Tzitzit. How many threads in the 'Tzitzit' of Karaites?

7
Q: What the X stands for in the front of Elliptic curve names

kelalakaI have seen Curve25519 and X25519, Curve448 and X448. I've seen a small note in this answer (Historical note: Originally, X25519 was called Curve25519, but now Curve25519 just means the elliptic curve and X25519 means the cryptosystem.) Is it a standard to say CurveABC is the Elliptic Curve an...

TeX
TeX
3
Q: Using a listing inside a figure-like environment

user35443I am writing a document dealing with formal grammars, containing numerous examples. I decided to use the lstlisting environment from the listings package over the mathematics align and give example grammars in the following manner \begin{lstlisting} S -> A | B A -> aA | empty B -> b \end{lstlisti...

RPG
RPG
23:54
4
Q: Naked Sprite Familiars?

J. A. StreichThere were two question about the new Sage Advice: Does Flock of Familiars produce endless wealth in the same manner as Find Familiar? What is a sprite familiar's AC? My answer to one and comment on another is that infinite wealth from a Warlock isn't possible because the Sprite is summoned wit...


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