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00:15
1
Q: Minimizing Kullback–Leiber divergence using the Hessian

Sami HadouajConsidering two continuous probability distributions $q(x)$ and $p(x)$, The Kullback–Leiber divergence is defined as the measure of the information lost when $q(x)$ is used to approximate $p(x)$. \begin{equation*} \mathrm{KL} (p(x)|| q(x)) = \int_{\mathbb{R}} p(x) \ln \frac{p(x)}{q(x)} dx \e...

DIY
DIY
1
Q: Splitting 320amp service to two 200amp panels with the meter base 200ft from the house

C streightI am installing a 320 amp service on my new house in Lewis County, Washington and am a little confused as far as how to split the service. I have my meter base set on a rack 200ft from the house because that is as far as PUD would go without adding a transformer. I have 3" schedule 40 coming from...

2
Q: Is there a tool to graph a function and have it compute its actual formula?

Krow Caw Is there a tool to graph a function and have it compute its actual formula? Thank you for your time beforehand. As the question implies, I want to identify the actual function, not the type, given a graph, for example the following Random curve: Is there such a tool that accepts a freely drawn...

2
Q: Is addition really a binary function??

Lumbini Ashutosh TambatMy class 12 maths textbook says addition is a binary function. But I had this experiment which caused a doubt. Addition is explained as a binary function because if you add more than two numbers you will have to do it in pairs of two. Now say you have 3 blue balls 7 black balls and 4 green balls...

00:33
2
Q: What do you call someone who is a fan of jets?

jcollumIf someone is a fan of British culture we call them an Anglophile. French culture, Francophile. Batrachophile, fan of frogs and other amphibians. Astrophile, fan of stars and astronomy. Is there a similar term for people who love jets? Or aviation in general? Jetophile seems awkward.

00:49
4
Q: Equivalent definitions of a measurable set in a manifold

SteveThere seem to be at least two ways of defining measurability in a smooth $n$-manifold $M$, and I want to know if these definitions are equivalent. (1) For the first one, we say $A\subseteq M$ is measurable if for each coordinate chart $(U,\varphi)$, $\varphi(A\cap U)$ is a Lebesgue measurable set...

01:14
1
Q: How do I stack tool icons vertically

WilburPostSometimes my tool bar icons end up in two columns, but I prefer them to be in a single column. How to I make the tools icons stack vertically? (I know this is a minor issue, but it annoys me.) Any suggestions? Thanks. Blender 3.10, Windows 11

3
Q: What were the incentives behind WinWord.Concept computer virus?

sourcreamI've just read this passage on the October 1995 issue of Virus Bulletin: WinWord.Concept The WinWord.Concept virus reported in last month’s Virus Bulletin has been found on at least one CD-ROM. Shortly after the journal’s September edition went to print, VB acquired a CD entitled Snap-On Tools f...

DIY
DIY
01:36
1
Q: Can I use electric radiant heating as primary heating?

HomeHelp12Our home was build in 2001 and currently has a oil furnace that is at the end of its life. We are looking for a more efficient heating option and stumbled across an electric radiant heating product called STEP HEAT that can be installed between the floor joists (we have access) so we wouldn't nee...

3
Q: Subdivision of a cube

Umer I am unable to get the subdivision like in the first photo. When I subdivide the cube I end up with a shape in the second image but when I select the face, I am unable to select individual faces like in the first photo. Am I missing something? My question is then: How do I select the faces like...

01:55
3
Q: How to clean/drain up flooded stairs in Dwarf Fortress?

Macho OnionI have accidently tunneled stairs into a small amount of underground water, and now my main hall has 1/7 water on the floor, and the stairs below are completely flooded, how can I remove it?

1
Q: How can I insert the backslash character ( \ ) before quotation marks (" ") in Emacs?

Pedro DelfinoI am running Emacs and writing on the scratch-buffer. This is my config file. After executing describe-mode, this is the list of minor modes running: Enabled minor modes: Auto-Composition Auto-Compression Auto-Encryption Blink-Cursor Column-Number Delete-Selection Display-Line-Numbers Doom-Modeli...

02:21
2
Q: Gravitational force, centrifuge?

TomySo after going through 5 pages on google on why and how a centrifuge separates out particles of different densities, I still don't quite get this. If Galileos statement is right that force can be split into two or more directions and they don't have any effect on each other like a bullet fired in...

02:32
2
Q: What is the name of the tool which involves a ball inside a sealed container that is them shook to grind up spices?

J. MiniI have seen a tool which is in two parts. In either part, you place both the plastic ball that comes with the tool and your spices. You then screw the two parts of the tool together (it's plastic, it's easy). Now that you spices and the ball are sealed within the container, you can violently shak...

1
Q: structuredClone is not a function - LWC

S.B.Currently working with arrays of objects of arrays of objects and filtering those lists to generate new lists, but do not want to mutate the original list. To do this, I clone the data, and in plain javascript I easily accomplish this with structedClone(). See JS fiddle: https://jsfiddle.net/vhek...

1
Q: Is Khalid ibn al-Walid a celebrated figure in Islam?

John StrachanKhalid Apparently there was an Islamic general called Khalid ibn al-Walid. Britannica encyclopedia Khālid ibn al-Walīd, byname Sīf, or Sayf, Allāh (Arabic: “Sword of God”), (died 642) Hero Apparently Khalid conquered Mecca alongside Muhammad, and then conquered the Arabian peninsula and Iraq, b...

03:16
1
Q: What are common reasons for US immigration officers to deny entry in the country?

StevenI recently got my US visa and I am really happy about it. Actually I recently saw a documentary where US immigration officer was denying entry to some people. I never thought you entry could be denied if your visa is valid.

3
Q: How do you make this perfect sphere of even quads and triangles?

Elan HicklerHow do you generate this? It is from: https://developer.blender.org/T57683 p.s. there's a triangle near the center of the image.

03:36
2
Q: Units of damping terms for harmonic oscillator

Mister MakI understand that in the equation of motion of a simple harmonic oscillator $\ddot{x} + \omega_0^2 x = 0$, $\omega_0$ has dimension inverse time. Since solutions are of the form $x(t) = A \cos (\omega_0 t + \phi)$, I also understand that $\omega_0$ is an angular frequency, and is often expressed...

TeX
TeX
2
Q: Passing a length as an argument to raisebox

LeoneTo summarize it: I think \depth is losing its information somehow and I was not able to fix it. I am trying to place an image inline and to adjust its vertical position with \raisebox, like so: \documentclass{report} \usepackage{xspace} \usepackage{mwe} \newlength\depth \newcommand\IMG{\raisebo...

03:53
2
Q: Are crown races interchangeable?

TimAre there proprietary differences that would cause one brand's crown-race to interface improperly with the bearing in another manufacturer's headset, assuming all parts were made for the same diameter steerer and the same steerer type (straight/tapered)?

1
Q: Within a single year, when is the optimal time to contribute to an IRA?

canary_in_the_data_mineShould I be making my maximum allowable IRA contributions as early as possible in the year (for instance, Jan 1st 2023 for the 2023 contribution), or as late as possible in the year (for instance, April 15 2024 for the 2023 contribution). I don't know if this answer is different for traditional o...

CS
CS
04:25
4
Q: John 9:35, son of man or son of God?

salahJohn 9:35; DRB; 35 Jesus heard that they had cast him out: and when he had found him, he said to him: Dost thou believe in the Son of God? John 9:35; ESV; 35 Jesus heard that they had cast him out, and having found him he said, “Do you believe in the Son of Man?" According to textual criticis...

3
Q: API: Time complexity of modifers.find()

X YSuppose it has many of modifiers in a single object, given that a modifier in that object, I want to find out the index: def ret_ind(mds, md): return mds.find(md.name) If I am sure that modifier is 100% in the object modifiers, is there a faster way to get that modifier index?

04:51
1
Q: Why some FIDO security fobs use keyboard emulation mode?

IlliakaillII was troubled from the very beginning by the fact that my U2F security fob acts as a keyboard and theoretically is able to press any key when no one is looking. Sometimes I accidentally touching it and then screen goes mad because of all those keystrokes. It seems to me a pretty bad design choic...

05:07
1
Q: Freehub is making loud noises and is randomly engaging/binding

Stelios LiakopoulosMy freewheel recently started making some faint weird noises. I didn't pay much attention because everything was working fine. But as time went on, it started getting worse and worse. The noise was getting noticably louder and the freehub had started randomly engaging and trying to spin the chain...

1
Q: When my stock options fully vest, is that the equivalent of a pay cut?

Throwaway10110010019Background I am approaching the end of my vesting term of 4 years. The vesting plan follows a typical 4 year term, with 1/48th of the total options vesting every month (after the initial year-long cliff). After the term ends, I will no longer be vesting any options, so my effective monthly compen...

05:35
1
Q: Unable to convert Ubuntu WSL1 to WSL2 because virtualization is not enabled in BIOS

Neilesh VinjamuriI am in a VMware Virtual Desktop and I am trying to convert Ubuntu to WSL2 using wsl --set-version ubuntu 2 but I am getting an error: Please enable the Virtual Machine Platform Windows feature and ensure virtualization is enabled in the BIOS. However I looked in the Windows Features panel and bo...

06:01
1
Q: How to put a FOR loop in a WHILE loop

fcoulombI have a strange matrix like this one in the picture Now, my goal is to change all the 1s with random complex numbers of modulus 1, but if the element $a_{12}=z$, then $a_{21}= \bar{z}$, so the complex conjugate of $z$. In the code CAC is this starting matrix, PCAC is the "complex" matrix I want...

2
Q: Default Mode Network and: hyper-connectivity, hypo-connectivity, interconnectivity and intraconnectivity

JbacaI have been reading into DMN and its relationship to psychopathology. However, in some papers I have noticed terminology that mentioned hypo-,hyper-,inter-, and intraconnectivity. While I understand what the prefixes mean, I fail to understand the actual functional relationship to the DMN. Could ...

06:37
4
Q: Probability of a diamond followed by an ace

CastawayFlyTwo cards are dealt at random from a standard deck of 52 cards. What is the probability that the first card is a $\diamondsuit$ and the second card is an ace? I thought I got this question right but the system said it was wrong. This is how I did it. So first I know that there are 13 diamonds in ...

06:51
2
Q: Use ReadList with a condition for values of a certain column to handle huge (>1 GB) text files

MogualusHello dear Mathematica community, I would like to import a very large data set as efficiently as possible. The dataset consists of four columns and 115 million rows. For the display in Mathematica, however, only rows are needed in which the last of the four coordinates lies in a certain number in...

07:02
4
Q: Tools For Analyzing A Recursive Relationship

FluidManI am working with a recursively defined sequence and don't know what tools are out there to understand the limit of the ratio of it's successive terms (which I have a hunch is finite). Here is the sequence: For $a_1=1$, $b_1=-4$: $$a_n=-\frac{(2n+3)}{(2n-2)}\sum_{k=1}^{n-1}a_kb_{n-k}$$ $$b_n=-\fr...

07:19
2
Q: StarTropics NES - Chapter 4 - Frequency Code?

LHMIn the NES Game, StarTropics, in Chapter 4 - right after you escape the whale with Baboo, Nav-Com tells you to "Input Frequency!!": There does not seem to be any clue in the game for what the frequency should be. The only thing that seems to be a clue is Baboo's recalling of Dr. J's last words, "...

CS
CS
2
Q: Why מצא instead of נמצא in Genesis 2:20?

Pascal's Wager (Genesis 2:20, Masoretic) וַיִּקְרָ֨א הָֽאָדָ֜ם שֵׁמֹ֗ות לְכָל־הַבְּהֵמָה֙ וּלְעֹ֣וף הַשָּׁמַ֔יִם וּלְכֹ֖ל חַיַּ֣ת הַשָּׂדֶ֑ה וּלְאָדָ֕ם לֹֽא־מָצָ֥א עֵ֖זֶר כְּנֶגְדֹּֽו׃ (DRB) And Adam called all the beasts by their names, and all the fowls of the air, and all the cattle of the field: but for ...

07:50
3
Q: Visa granted, may I ask another visa and conserve the first?

Matte.CarI applied for a Working Holiday Visa in Australia (417). It had just been granted and that's OK because I have to go there soon to sort some stuff but I was thinking to stay there working later this year so would be cool to freeze my WHV, apply for a tourist, get there now as a tourist then go aw...

2
Q: Problem: Geometry Nodes Creating Instances Automatically

Daniel MeurerI'm trying to make a scene in Blender where I have several duplicate objects in a mesh and I need to make it expand without creating new clones. Would anyone know how? I'm using a Lattice to expand the "mother mesh" but clones suddenly appear and disappear. Video here: Video

1
Q: How does birthday attack on message authentication work?

TimIn Cryptography Engineering: 2.7.1 Birthday Attacks Birthday attacks are named after the birthday paradox. If you have 23 people in a room, the chance that two of them will have the same birthday exceeds 50%. That is a surprisingly large probability, given that there are 365 possible birthdays. ...

3
Q: How can the bear-man refer to a "Jack-in-the-box" in The Hobbit?

GloinThe Hobbit is supposedly set waaay back in our world. Yet, Beorn refers to "jack-in-the-box" as in the toy, when the dwarves show up in pairs. How can this be? How can anyone in that world/era, let alone this half-bear recluse, know about a mechanical invention that was first invented (according ...

08:10
2
Q: Can I see separation of variables as a tensor product?

SimoBartzCan I see separation of variables as a tensor product? For example, in a radial potential, the separation of variables brings to the solution $R(r)\Theta(\theta) \Phi (\phi)$. This sounds like an element of the space spanned by $|r\rangle\otimes|\theta\rangle\otimes |\phi\rangle$ where $R(r)$ liv...

CS
CS
08:35
4
Q: Why is Reuters considered as an independent and unbiased political news source?

Schwarz KugelblitzReuters is very often used and quoted in parliamentary hearings, google updates and different news outlets. Many people say that this is because of the "independent " nature of reporting of Reuters. But how is this so? What makes Reuters different from the other news channels?

3
Q: Who are the "international observers" at elections to determine if they are free and fair?

Schwarz KugelblitzWe often hear that "international observers" deemed that certain elections were fair or unfair. But who exactly are the groups or people among these international observers and who chooses them? How can we be sure of their credibility?

2
Q: How to install WAMP with multiple hosts on a non-standard port, over a FIOS connection?

danielhI am trying to upgrade my server on a home network, supporting a few personal and club websites. The issue: An aging legacy server running in an internal network (that includes several personal use computers). The server supports two public domains, under a single IP address. For example:...

CS
CS
09:00
2
Q: Would inductor energy reduce to zero in this case?

hanaI would like to ask about this example. Initially switch at position a and then when current reaches some constant value then it's switched to b. I'm interested in what happen in real life. Someone said that when you switch from a to b, there is a time when the switch is open/floating (R is infin...

TeX
TeX
1
Q: How to put a tcolorbox in one frame beamer

Nam Tran LeI want to put a tcolorbox in one frame of beamer class. I create the vd enviroment such below code. Compiling the following code meets error "File ended while scanning use of \beamer@collect@@body." Please explain why it is and how to correct the code. Thank you in advance! \documentclass[17pt, h...

09:32
2
Q: How do I calculate phi(z) to 4dp when my Normal Distribution tables are to 2dp?

user997112I have two Normal Distributions representing weights: X ~ N(30, 25) and Y ~ N(32, 16) Calculate the probability an item from distribution Y weighs more than X, i.e P(Y - X > 0). I did everything correct and ended-up with: B = Y - X B ~ N(2, 41) = 1 - P (B < 0) = 1 - phi((0 - 2)/root(41)) = 1 - ph...

09:52
4
Q: Is there a reference translation of the Declaration of Human Rights?

LaravelI know of two translations of the Declaration of Human Rights: https://la.wikisource.org/wiki/Universalis_de_jure_hominum_declaratio https://la.wikisource.org/wiki/Universa_humanorum_iurium_declaratio But both are anonymous and without source. Is there a reference translation of this text? Or a...

1
Q: There was a movie I saw in the late 60s/early 70s, people were trying to drill into a blue alien ship. I thought it was called “10,000 years to earth”

CalI watched some trailers of 5 million years to earth, but that wasn’t it. And it didn’t have “journey” in the title. The blue ship-thingy was pretty tough to drill. Finding this movie is driving me nuts!

RPG
RPG
10:23
1
Q: Does the Defensive Duelist feat work with Psychic Blades from the Soulknife Rogue subclass?

JakeI'm making a Soulknife Rogue and was wondering if the feat Defensive Duelist would work with the Psychic Blades or if I'd need a regular dagger to gain benefit from it. Defensive Duelist: When you are wielding a finesse weapon with which you are proficient and another creature hits you with a me...

2
Q: Is the below sentence ambiguous?

EliThe sentence is: “X is not legal in all contexts” Couldn’t the logical negation be interpreted as applied to either “legal” or “legal in all contexts”, the former would result in “X is illegal in all contexts”, where the latter would result in “X is illegal in some contexts” Is there a name of th...

1
Q: Recursive ZIP won't work in zsh

arielUntil catalina I used zip -r xmp.zip . -i *.xmp To add all xmp files from subdirectories to xmp.zip. Upgraded to mojave (zsh) and now it won't work anymore (return no matches found). How could I do this?

11:27
5
Q: How can I add a vertical spacing in a `CheckboxBar`?

RupeshI have an example here from the solution of @krasten 7. In this I would like some vertical spacing between the checkboxes. Any ideas? prjs = {prj1, prj2, prj3} = RandomReal[#, 100] & /@ {1, 2, 3}; Manipulate[ListPlot[prjs[[projectNo]], Joined -> True], {{projectNo, {1}}, Range[Length@prjs], Co...

11:37
5
Q: Is there a such thing as a free group generated by a free group?

pyridoxal_trigeminusIs there a such thing as a free group generated by a free group? Let $F(A)$ be a free group generated by the elements of a set $A$. If we momentarily consider $F(A)$ to be simply a set of words on elements of $A$, is there a such thing as $F(F(A))$, i.e., the free group generated by the elements ...

11:50
2
Q: Can I run Google Authenticator from Ubuntu without a cellphone?

Paul A.I'm running Kubuntu 21.10. Can I run Google Authenticator without needing a cellphone?

12:20
2
Q: Time delay between consecutive photon absorptions by atoms/molecules?

MehmerWe are just getting introduced to some basics of quantum physics at school and in my nationally prescribed school book, its written that: Planck assumed that radiation could be subdivided into discrete chunks of energy. He suggested that atoms and molecules could emit or absorb energy only in di...

12:37
1
Q: Preposition with abschreiben

Loma HarshanaWhich preposition goes with the verb abschreiben? For example if I want to say During the exam he copied the answer from his colleague Do I say Während der Prüfung hat er die Antwort von seinem Kollegen abgeschrieben or Während der Prüfung hat er die Antwort bei seinem Kollegen abgeschrieben

13:02
2
Q: How do I identify the correct replacement cones, or the right cones+axle?

SamIn this video the "path" left by the ball bearings in the cone is quite wide whereas the path in my cone (on a road bike) is very narrow. I am wondering if perhaps the narrow path meant higher stresses, resulting in the pitted areas visible in the picture. I am also wondering whether the differ...

13:17
2
Q: Replicating margins. columns and grid of an existing design layout InDesign CC

user3413128If I find a layout example that I like and want to imitate the grid layout whats the easiest way to go about it? Right now I have the example on a layer and just putting ruler guides on it to figure out how many columns. The rows I am finding tricky as I can't seem to find a consistency. I am lin...

13:52
2
Q: What is this new scrolling bar, and how do I remove it?

Benjamin McCarthyI’ve combed everywhere but I can’t seem to even find someone with a similar problem! It’s this list of thumbnails:

1
Q: Im Äußeren in the sense of "in appearance"

Loma HarshanaCan "Im Äußeren" be used in the sense of "in appearance". Can I say: Die beiden Modelle ähneln sich im Äußeren.

14:03
1
Q: Why is Nasa retiring ISS

bakaloloIs there no need to do experiments in space or have that thing where people can go into space. If they spend so much time building it why just trash it for essentially nothing?

6
Q: Introduced intermediate variable in structured binding definition?

MasquueIn [dcl.struct.bind] 9.6.4, there is definition of structured binding when initializer is a class type with std​::​tuple_­size<E>​::​value properly defined: ... variables are introduced with unique names ri as follows: S Ui ri = initializer ; Each vi is the name of an lvalue of type Ti that refe...

14:34
1
Q: Java implementation of Employee class hierarchy

kairodesuWe were tasked to do this assignment where there is the base class employee and two derived class part-time and full-time employees. Here is what I came up with: import java.util.Scanner; class RunEmployee { public static void main(String[] args){ String inputForP; Scanner s ...

14:58
2
Q: Computation of maximum likelihood estimates

Ethan MarkQuestion Solve for the maximum likelihood estimates of the distribution with parameters $\alpha$ and $\beta$ and the following pdf, where $x > 0$: $$f(x; \alpha, \beta) = \frac {\alpha} {\sqrt {2\pi \beta}} x^{-\frac 3 2} \exp\left[-\frac {(\alpha - \beta x)^2} {2\beta x}\right].$$ Hint: You shou...

15:09
1
Q: Can we get name of quick action which invoked flow?

Tushar RashinkarI have one generic flow. Multiple quick actions can invoke it. So inside flow, Can we get which quick action has invoked this flow? or Can we pass any values from quick action to flow ? NOTE : There are 2 quick action on same 'Lead' record.Both the actions invokes same flow. So passing recordID t...

TeX
TeX
15:45
2
Q: How do I change the caption of the figure to "graph"?

Eric ZhangCurrently my code is \caption{Change in biomass in KCl group} and it displays "figure 1: Change in biomass in KCl group" however I would like to change it to "Graph 1: Change in biomass in KCl group" Any suggestions? Thanks

15:55
2
Q: How to repair leather supports on a sling chair?

fixer1234Thirty years ago, I bought some chairs that are still my favorites, but they are in need of repair. The chair's supporting structure consists of a canvas sling that hangs from a bent wood frame. A large leather cushion fastens into the sling. I found a picture of a chair with essentially the s...

GIS
GIS
16:05
1
Q: Concurrent ogr2ogr processing of GeoJSON using offset/limit

AvocadoI have a line delimited GeoJSON file with around 600k features. Standard processing of it takes ~53 seconds: ogr2ogr -f "Esri Shapefile" ./out ./in.geojson Another approach I tried out was using gnu parallel: concurrent_ogr() { ogr2ogr -f "Esri Shapefile" -sql "SELECT * FROM in_layer LIMIT 10...

1
Q: MN 62 Translation Request

Jbag1212In "The Longer Advice to Rāhula" the following appears: Muditaṁ, rāhula, bhāvanaṁ bhāvehi. Muditañhi te, rāhula, bhāvanaṁ bhāvayato yā arati sā pahīyissati. Bhante Sujato translates this as Meditate on rejoicing. For when you meditate on rejoicing any discontent will be given up. Thanissaro B...

16:31
1
Q: Does a non-resident need a patent attorney to file a Provisional patent application with the USPTO?

user2297550I have read that a non-resident needs a qualified patent attorney to file a non-provisional patent application directly with the United States PTO. My question is whether this requirement is also true for a provisional patent application? (My country of residence is Vietnam, and it probably does...

RPG
RPG
2
Q: Hide in Plain sight (HiPs) - does it work if I cast light on myself?

DigiusCould a rogue with Hide in Plain sight (SP- e.g. shadowdancer) (HiPs) cast on themselves the spell light just to create shadows to hide in? Reading "light and darkness" in the rule compendium 79 it appears clear that someone can hide even in an area of bright light. In an area of bright light, m...

16:51
3
Q: Creating trill staff in lilypond

timboI'm learning BWV775 (Bach Invention IV) and the score I'm working from has a small extra staff for a trill in measure 17 The treble & bass staves are easy enough in Lilypond, and for the trill mark, I've just used /trill in the treble voice f-1[ g] g8.[ \trill f16] which gives me What's the be...

17:01
1
Q: My UK train in 2 weeks got canceled, can I trust the train will go if I book another one for the same day

someone12321I had booked a train from Manchester to Milton Keynes Central in about 2 weeks from now with the mobile app TrainLine, however recently I got email that the train got canceled. What is a bit weird for me, if I go to the train company website, which actually runs the train service (Avanti West Coa...

17:17
3
Q: Putting a Graphics3D primitive on a Plot3D

SyedClear[x, y, expr] expr = 5 x y - x^4 - y^4; max = Maximize[expr, {x, y}] {25/8, {x -> -(Sqrt[5]/2), y -> -(Sqrt[5]/2)}} I would like to generate a Plot3D and put a Ball at the maximum point. Show[ Plot3D[expr , {x, -3, 3}, {y, -3, 3} , PlotStyle -> Directive[Opacity[0.3], LightRed] , B...

17:46
1
Q: A problem with QED

JavaGamesJARI have a small problem with understanding QED. The equations of motion in QED are $\square A^\mu=e\bar{\psi}\gamma^\mu\psi$ $\left(i\gamma^\mu\partial_\mu-m\right)\psi=e\gamma^\mu A_\mu\psi$ If we analyze first equation we get that both particles and antiparticles create the same electric potenti...

1
Q: Is extracting an interface just for testing purposes a code smell?

George Z.I will explain with an example. Suppose that my domain is Cars. Everyone around the software, talks about cars. Car is the aggregate root of aggregate roots. For example, CAR table has 150+ columns in database (irrelevant for this question, but for you to imagine). So, there is class in the syste...

18:16
1
Q: Feasibility of this population of surviving dinosaurs

faddllzWe assume the following for this scenario: There is a kind of surviving non-avian dinosaur. They live primarily in Congo Basin. They evolved from a smaller, omnivorous kind. They fill multiple niches in a small area deep in the Congo. One of their kind evolved to be a carnivore, thus adopting a ...

2
Q: What kind of Taylor expansion is this?

carlos85Let $b \colon \mathbb{R}^n \to \mathbb{R}^n$ be $\mathcal{C}^{1,1}(\mathbb{R})$, i.e. its derivative $b_x$ is Lipschitz. Let $0 \leq \lambda \leq 1$ and define $x^\lambda=\lambda x_0+(1-\lambda)x_1$ for $x_0,x_1 \in \mathbb{R}^n$. In [Yong, Jiongmin, and Xun Yu Zhou. Stochastic controls: Hamilto...

2
Q: Help to make fully adjustable paper stack in Blender 3.1 (from Blender 2.93)

Juna PaichadzeA complete beginner here trying to recreate some projects to learn by experience. I was following blender 2.93 tutorial https://www.youtube.com/watch?v=Dc2Mt0AK-qA&list=PLbHww4s6zG1UZ5-wwtyp-IhZLzY1X2tSr&index=11 ) on how to create a fully adjustable paper (money) stack Number of papers in stac...

1
Q: How can I model this in 2D mesh?

Leopold StotchThis is my first time ever assignment for a job application using Blender. I have been learning Blender for a month and I should be able to do this on my own, but ... I am modeling a cap. It all went well until I got stuck on this little piece. I have to model it in 2D mesh and I know it is kinda...

3
Q: Can I take away permission from a specific user in the command setfacL?

JAckI know that this setfacl is to give permission: setfacl -m u:user:rwx myfolder But is there one to take permissions such as: setfacl -m u:user:-rwx myfolder

DIY
DIY
18:41
1
Q: How to drain a toilet bowl?

CriggieI want to clean a stained porcelain toilet bowl. It feels like a small crusty coral reef right at the bottom in the water, visible to anyone looking down. I suspect its like calcium/lime but this is not normally a problem in our area. Plain scrubbing with a brush has made no difference. I've t...

2
Q: Under what conditions does manganese dioxide lose its catalytic property?

Snack ExchangeWe know that under standard conditions (room temperature and 760 mmHg air pressure) we have this reaction: $$\ce{2H2O2(l) ->[MnO2] 2H2O(l) + O2(g)}$$ Here, manganese dioxide is behaving as a catalyst, accelerating the decomposition of hydrogen peroxide into water and oxygen. If we want manganese ...

19:10
1
Q: Is this exam question on traffic patterns wrong?

user62723I just don't know the difference between Left-hand traffic and Right-hand traffic. I thought Left-hand traffic uses when land to the East and right-hand traffic for when land to the west. Is anyone help me out? Also, I got a question from the book about traffic patterns and I think the question i...

19:35
3
Q: Could Putin become impeached?

ippedAt least on paper, the Russian Federation is a constitutional democracy with the legal possibility of impeaching the President. There were three attempts to remove Yeltsin from office and Wikipedia states that President Putin is now also facing possible impeachment https://en.wikipedia.org/wiki...

20:03
4
Q: Was 'Obelix and Co.' a pyramid scheme?

EleventhDoctorObelix and Co. is the twenty-third volume in the Asterix series. Acting for Julius Caesar, Caius Preposterus claims to be a menhir buyer and offers to make Obelix a rich man, by buying every menhir he can make. Preposterus creates an economic boom in the Gaulish village by continuously raising pr...

20:21
2
Q: Why do all magic schools have streaming?

user6760Streaming is the practice of grouping students based on their magical potential, usually at the end of the entrance exam the candidate has to don a talking pointed hat which then announces their respective classes. Supposedly this should encourage competitiveness in gifted classes while improve s...

20:33
2
Q: Rear tire gets flat every month for unknown reasons

nightriderMy rear tire gets flat almost every month without any obvious reasons. Few times it lost the pressure while riding but I do not see or remember puncturing it, and once it was on a good tarmac street where I would not expect. Yesterday I parked the bicycle in the morning after arriving and found t...

6
Q: How to visualise the area between polar curves using filling option?

CasperYCPolarPlot[{theta, Exp[theta]}, {theta, 1, 1.2}, Frame -> True, PlotLegends -> "Expressions" ] Looked into the filling option but does not seem to be able to make it work in the case... Trying to make a visual of this

20:55
1
Q: Measuring latency on photodiode

RonAttempting to measure latency on a photodiode. This is the circuit I've put together: Source TS7805 to give my 5V (from a 12V rail) 1.2kHz square wave into first T1 D1 is a BPW41 scope on source and D1 D1 driving base on another transistor rather than driving load directly Output is as follows...

1
Q: How to render a time-of-day string like '16:42' with a site's chosen time format?

O. JonesI have a need to display a time-of-day value in a site's chosen time format. For example I have 16:42:18 and want to display it as 4:42 PM if the time_format option is g:i A, or 16:42:18 if the time_format is H:i:s. I need this to render data captured by HTML5's <input type="time"> form field. Ho...

2
Q: Can the Earth be seen from the moon when we have a total lunar eclipse at the perigee?

Snack ExchangeWe know that the Moon doesn't have an atmosphere; thus the sky is seen dark. Also, from this question, the angular diameter of the Earth viewed from the Moon is a bit bigger than $2^\omicron$ at the perigee, meaning that it will block the Sun completely (the Sun has an angular diameter of $0.538^...

CS
CS
1
Q: Luke 6:44 is a straightforward illustration, or is it?

AnneJesus is speaking about hypocrites with planks in their eyes. He then speaks of good trees being known by their good fruit; corrupt trees don’t bring forth good fruit. Then comes the verse in question: “For every tree is known by his own fruit. For of thorns men do not gather figs, nor of a bram...

21:13
4
Q: Identity with number of surjective functions

Jean GergonneLet $S(n,k)$ denote the number of surjective functions from $\{1,2\cdots,n\}$ onto $\{1,2,\cdots,k\}$. I have verified for $n = 2, 4, 6, 8, 10$ that $$-(1/2)S(n,1) + (1/4)S(n,2) - (1/8)S(n,3) + \cdots + (-1/2)^n S(n,n) = 0$$ Is this true for all positive even n? Is it a known identity? Any nice ...

21:27
1
Q: Goldberg variations - chord progression changes between variations

octopusThe Wikipedia article on the Goldberg variations sets out the chord progression which all variations follow. In some bars, different options are separated by commas and it says there are different options taken by different variations. What is meant by the comma notation here? In particular, what...

GIS
GIS
1
Q: QGIS: importing dataset based on zipcodes, not coordinates

Titanfor a current project I want to connect nation-wide PV-modules (photovoltaic modules) to power grid nodes via zip codes and their respective power demands. For this reason, I downloaded QGIS as I was told it is the easiest way to achieve this result. So far, I have been able to import grid nodes ...

TeX
TeX
1
Q: Move arrow descriptions/labels in tikz, so that they do not overlap

Stefan 44I am using this piece of commands: \begin{figure} \centering \begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto,node distance=4cm, thick,main node/.style={circle,draw,font=\Large\bfseries}] \node[main node] (S) {$S$}; \node[main node] (R) [below left of=S...

1
Q: Pause within an item of an animated list in a beamer presentation

vauhochzettI have a slide with an animated list. For one item, I want to uncover the second half of it only after a keypress. When I use \pause, I have to press twice, but nothing happens and the second half appears with the next item. Minimal example: \begin{itemize}[<+->] \item click 1 \item click 2 \...

2
Q: How can I use the Cauchy-Schwarz inequality in this function of random variables?

L. JohnsonI have the function $\rho_{\lambda}:RV(\Omega)\rightarrow \mathbb{R}$ defined on the space $RV(\Omega)$ supported over some scenario set $\Omega$: $\rho_\gamma(X)=\frac{1}{\gamma} \log (\mathbb{E}[e^{-\gamma X}])$ where $\gamma>0$. Now in my book they claim that the Cauchy-Schwarz inequality show...

RPG
RPG
2
Q: Which Action is required to throw Alchemist's Fire?

Leo IzenThe Alchemist's Fire item description states the following (PHB 148): This sticky, adhesive fluid ignites when exposed to air. As an action, you can throw this flask up to 20 feet, shattering it on impact. Make a ranged attack against a creature or object, treating the alchemist's fire as an imp...

21:49
2
Q: bash move file relative to its position

T1Mas the title says, can i move a file relativ to its current position? Lets assume I am in the root directory, with following file strukture: ... ├──home └──user ├──Documents └──Downloads └──foo.bar ... I want to move foo.bar from Downloads to Documents. You could do mv /h...

22:03
3
Q: Is a line bivector the same thing as a vector?

tryingtobeastoicIn the abstract of this article, the author said the following: An element of this vector space will be called a line bivector. According to wiki, ..., a vector space (also called a linear space) is a set of objects called vectors, ... So, if a line bivector is an element of a vector space, t...

22:17
5
Q: Draw the Ukrainian Flag

GingerDraw the Ukrainian Flag As you will probably know, there is a war going on in Ukraine. I noticed that it seems nobody has posted a Ukrainian flag challenge yet, so I thought I'd do it myself in support of Ukraine. The Challenge Here is the flag: The flag is divided horizontally across the middl...

TeX
TeX
1
Q: Changing format of paragraph skip for a 400-pages document

Valerio De AngelisI am writing a long LaTeX document using the book documentclass, and after having typed already almost 400 pages, I have decided I want to change the format for new paragraphs to be more similar to the letter style, meaning that instead of an indented line, I would like to have some vertical spac...

22:54
2
Q: Smooth Push Slide (Swish Pan) Transition in the VSE

blender28is there any way to achieve such a smooth transition between two videos in the VSE, such as the transition that can be seen in the start of this video? https://www.youtube.com/watch?v=kxjNchN189Q&ab_channel=JavierMercedes

DSP
DSP
2
Q: When is it necessary to use a Kalman Filter, and not a simple estimation method?

doumhamI know its a stupid question, but I got understand this very fundemental point. Say we have a sinousodial signal, which we want to extract from a noisy (known variance and mean) measurement. It is mathematically easier for me to write a maximum liklihood algorithm which converges to the amplitude...

23:14
4
Q: Should I merge a preprint with the peer-reviewed version of this article on Google Scholar if the preprint has already been cited?

MatthiasI have uploaded a preprint to PsyArXiv in 2021. The preprint is now published in a peer-reviewed journal. Normally, I merge the two so that only my published articles show up. However, this time my preprint was cited, and I'm not sure if I lose the citation count after merging. Does anyone happen...

2
Q: Evaluation under tensor products

craaaftCould anyone explain to me the highlighted step in this calculation? Can I just exaluate the tenor product component wise? The first step is basically $$(ev_{V}\otimes id_{V})\circ(id_{V}(v)\otimes coev_{V}(v))=(ev_{V}\otimes id_{V})(v^ie_{i}\otimes(\epsilon^{j}\otimes e_{j}))$$ and then the sec...

2
Q: Can a Chess Federation lower their NM title standard so people can get the benefits of it?

cmgchessFrom what I read in the Wikipedia page https://en.wikipedia.org/wiki/Chess_title#National_titles it mentions Some national chess federations award titles such as "National Master" (NM). National chess federations are free to set whatever standards they want for such titles, which are not recogni...

23:33
2
Q: If planets are ellipsoids why don't we have 3 diameters?

Snack ExchangeWe know that each ellipsoid has 3 diameters named $2a$, $2b$, and $2c$. The Earth and all planets, in general, are ellipsoids (Saturn is the best example because it's the most oblate planet in the solar system). But all we have read and heard are two types of diameters: equatorial diameter, and p...

TeX
TeX
2
Q: Inline verbatim text keeping the same font as normal text

zezolloMy software automatically creates LaTeX documents. I need to display some text that I have no control over (it will be provided by the user), so it can contain problematic characters (like _ or \ or $ etc.) that would break compilation. I could look for each of these special characters and escape...

23:53
1
Q: How can I totally remove an app from my account?

PaoloI had downloaded a free app and now I don’t need it. I want to remove it from purchase list. I don’t want to hide it, I want to totally remove it from the purchase and from the hidden purchases as well. Can I do this without contacting Apple?

5
Q: How does LDS interpret Colossians 1:16?

Mike BordenFrom this answer I gather that LDS teaches that all beings are eternal and that by eternal it is not meant existing timelessly beginning at some point but, rather, not actually having any starting point. Indeed the answer asserts that the first "stage" in the existence of every person (and also ...

2
Q: Von-Neumann vs Bernoulli Utility? Do properties of Bernoulli translate to VNM?

KinnoThis is for a HW question but I am not asking on how to solve the question, just a conceptual question. According to my understanding, A Von-Neumann Utility function represents preferences over lotteries of monetary outcomes. A Bernoulli utility function represents preferences over sure amounts ...


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