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CS
CS
00:00
1
Q: Euler-Lagrange equation in curved spacetime

Rob TanThe action of a field $\phi^\mu$ in flat $n$-dimensional spacetime is $$ S = \int \text{d}^n x \mathscr{L}(\phi^\mu(x),\partial_\alpha \phi^\mu(x)) $$ From an infinitesimal variation of field configuration, and discarding a boundary term, we have E-L equations $$ \frac{\partial \mathscr{L}}{\part...

2
Q: UV map appears on blender, but saves as a blank image

Soflyi was coming back to a project i've abandoned for quite a while, i'm trying to learn about UV maps and making my own textures, but for some reason, with this project in particular, there's something weird happening When UV Unwrapping the object (Using the smart UV option if that helps), the map a...

GIS
GIS
2
Q: Querying by GlobalID in ArcGIS Pro

zemken12I can't figure out the syntax to query a feature class by GlobalID because the GlobalID is not a string, float, etc. What is the syntax to query by GlobalID in SQL using ArcGIS Pro? SELECT * FROM TABLE WHERE GLOBALID = {31595CF4-D5C7-49A4-85D2-C245BEBC009F}

00:27
2
Q: As a TA, how much information should I share with the professor about students?

Lyra-xyThis is my first semester being a TA. When students email me and include personal reasons (e.g. sick family member or mental health struggles) when they ask for things like extensions or to switch recitation slots, how much detail should I include when raising these issues to the professor teachi...

5
Q: What is the earliest point in human history that gold could be hoarded?

Cyrus DrakeI am currently brainstorming the history and logistics of the dragon species in my urban fantasy story about immortal mythical creatures. The way I currently envision them, dragons have their stereotypical signature hoards of treasure because they essentially use gold like solar panels: the celes...

2
Q: Best Meditation for Stress

EggmanI've been meditating using different types of meditation for years now. I've been feeling a lot of stress lately, and I want to calm down in the ideal way. I've been reading neuroscience studies claiming that breath meditation is the most effective to calm down the amygdala, a key brain region in...

00:43
3
Q: Holes on inner side of rim are off-center. Problem?

SzabolcsI noticed that the holes on the tyre side of a rim are not centred. Some are more to the side, some less. The image below shows a hole that comes up all the way to the edge of the central channel on the tyre side of the rim. Please compare the hole position to the rim edges, not to the red rim ta...

5
Q: Enantiodromia--How Do Symbols Undergo an Inversion of Meaning?

Nelson AlexanderI am looking for writings in philosophy, semiotics, or psychology that deal with the shifts and ultimately the inversion of practical meaning in symbols. This would be something like Orwell's concept of doublespeak or Jung's references to Heraclitus and enantiodromia. Let me give an example of wh...

TeX
TeX
3
Q: Make edges parallel

B612The edges are matching. I would like them to be parallel horizontally. I tried changing the value of the yshit parameter, but it didn't work. \documentclass{article} \usepackage{geometry} \usepackage{tikz} \usetikzlibrary{automata, arrows.meta, positioning, shapes} \begin{documen...

01:13
5
Q: How do Latter-day Saints respond to the claim that the Book of Mormon is based on "Manuscript Found" by Solomon Spaulding? (aka the Spaulding Theory)

Hold To The RodThis topic has come up occasionally in other posts, but I found no question on the site asking about this specifically. In 1834, ED Howe published Mormonism Unvailed [sic], claiming based upon the work of Philastus Hurlbut that the Book of Mormon, published in 1830, plagiarized an earlier work o...

01:32
5
Q: MOSFET overheating and voltage drop

Davide DemarinoI've searched on the network for days but couldn't find a solution to my problem I hope you can help me. I want to create a DC motor speed regulator using IRFZ46N as a power MOSFET and a 10k potentiometer. I created this circuit and tested it on a breadboard: The circuit doesn't work properly an...

CS
CS
1
Q: Is there any agreement between Putin and NATO?

BootstrapThis website has states that: On the 23rd of May, 2007, Putin signed an agreement (no 4100940-4) concerning the future intervention of NATO in Russia, in the event of civil disturbances, and natural and technological disasters. Is there any way to make sure this claim is valid?

4
Q: Should I admit to accidentally cheating on an exam?

DanielLike most students and professors during the pandemic, I attended my classes online for over a year. The online lectures weren't mandatory, and I stopped attending after the first day and relied on my readings to guide me. I only saw my professor once that entire semester (1st day) and tried to ...

02:13
2
Q: Pointwise continuity of dominated non-negative function

rmceraflLet $M$ be a topological space and $f, g : M\rightarrow\mathbb{R}_+$ be two non-negative functions with $f(x_0)=g(x_0)=0$ for some $x_0\in M$. Suppose further that $f(x)\leq g(x)$ for each $x\in M$, and that $g$ is continuous at $x_0$. I was wondering if this is sufficient to conclude that $f$ mu...

2
Q: Why Won't My Light Instances Stick To Their Parent Vertices?

glen_candleI have a light parented to a plane with four vertices (with Instancing on the Plane set to Vertices). The light and the plane both have an origin of 0,0,0. So far so good. But when I rotate the plane the lights slip out of alignment with the vertices they are attached to. What am I missing here...

GIS
GIS
2
Q: Can you use SQL in QGIS?

Chace CarpenterIs there a way to use SQL on a shapefile dataset in QGIS? I am used to using SQL to analyze my data.

02:30
2
Q: Is the sample proportion (p̂) a random variable?

Joseph_and_BettySince it should vary from sample to sample, I suppose it should be a random variable. But if it is, when we write the variance of sample proportions, should we write an uppercase P-hat as the index notation of sigma? But in most textbooks and formula tables, it seems that a lowercase p-hat is usu...

DSP
DSP
02:42
2
Q: Spectrum Width vs Data Carrying Capacity

georgersNewbie struggling to understand why a larger chunk of signal bandwidth is needed to carry more information. For example, why do you need more bandwidth to carry video as opposed to voice or CW? Apparently missing some fundamental concept here. Have a sneaking suspicion this will lead to informat...

4
Q: The Uplift War - "fisherman with a bad complexion" - am I missing something?

AndrewIn Brin's The Uplift War, Fiben Bolger (the uplifted chimp) goes to (enemy-occupied) Port Helenia to connect with the underground movement there. He has a garbled message about how to recognize the entity he's supposed to meet: Fiben was looking for someone dressed as a fisherman something ab...

03:03
3
Q: Are people allowed to keep cash in pocket when going through security?

mooThey tell people to empty stuff into a tray, but what is the point of putting notes such as travel money in there?

1
Q: Can I ask ATC a radio check with a handheld radio?

fabI bought a handheld portable radio capable of transmitting in the air band and I was wondering if I can request a radio check to the ATC to see if the radio works properly. I know it's illegal to talk over those frequencies unless you're an aircraft (or at least I suppose it is), but I wonder if ...

2
Q: What happened to Turner Bikes?

haxonekI could be misremembering this but back in ~2014 turner bikes made a bunch of really high quality full suspension mountain (and other) bikes in the US. I just decided to look them up today and they only have two bikes, neither made in the US, and both looking quite sad (a no suspension gravel bik...

RPG
RPG
03:30
3
Q: Does the Death Ward spell prevent the side effect from the Nimbus of Pathos feature from the College of Tragedy bard?

Ygor MatheusThe Nimbus of Pathos feature from the College of Tragedy bard states that after 1 minute the target immediately drops to 0 hit points and is dying. Does death ward prevent that?

Law
Law
03:51
3
Q: If a law is blatantly unconstitutional, is a search warrant based on that law valid?

ViktorApplications for search warrants are typically ex parte. In such a proceeding the person who owns the property to be searched and/or seized cannot challenge the unconstitutional laws that form the basis of an affidavit justifying that probable cause exists for a search. Does there exist a basis t...

RPG
RPG
7
Q: What is the typeface used on the 'red box' Basic D&D boxed set exterior logo?

LexibleJust what the title says. The typeface is not Filmotype's Quentin which was used for the logo in the first version of AD&D. Filmotype Quentin: What is the typeface below?

DBA
DBA
2
Q: Poorly performing Stored procedure using cached data while testing

lifeisajourneyI have a stored procedure that takes about 15 seconds to run the first time and the subsequent runs take 1 to 2 seconds. If I wait for an hour and run it again then it takes 15 seconds again. I'm guessing that it's using the cached data in the buffer pool on the subsequent runs where as the first...

04:10
2
Q: How stack text over an arrow

murrayAs part of a visualization of a mapping from a planar domain to another planar domain, I want to create a Row of the form Row[{domain,mappingArrow,image} where domain and image are graphics and mappingArrow is an arrow with text stacked above it. The object mappingArrow should appear like this: ...

CS
CS
3
Q: What are the specifications of Texas's new motto law?

Arcanist LupusTexas has a new law requiring public schools to display "In God We Trust" posters if donated. What are the specifications of an item that would be required for mandatory display? I've seen that it has to be durable poster or framed, and it has to have state and US flags, and can't have other mess...

04:25
4
Q: Noetherian but not strongly Noetherian

Dat Minh HaWhat are some examples of Tate rings $R$ (i.e. Huber rings with with topologically nilpotent units) which are Noetherian but not strongly Noetherian ($R$ is strongly Noetherian iff for all $n \in \mathbb{N}$, the corresponding $R$-algebra of convergent power series $R\{x_1, ..., x_n\}$ is Noether...

2
Q: What does the term Other Revenue mean?

BobI am looking at Target's recent earnings release which can be found at the following URL:Earnings Release. On page five it show two types of revenue: sales and other revenue. What does other revenue represent?

CS
CS
1
Q: What is the most accurate approach for de Novo sequencing?

CaterinaI'm trying to decide between PacBio HiFi or Illumina sequencing platforms. When considering a hybrid approach I was told by someone at a sequencing facility that adding short reads to polish the HiFi reads assembly lowers the quality of the assembly and introduces more errors that corrections. Wh...

05:20
1
Q: MOSFET current mirror does not mirror the current

gibai caoI am building a current mirror based on MOSFETs. Below is the schematic of the current mirror. Supposedly the I_probe1 and I_probe2 should be equal as what current mirror should do, but I plotted the I_probe1 and I_Probe2 against the VC (the voltage on the left side) and found these currents are ...

05:52
2
Q: Why isn't #i just called #i?

AaronThis answer to How to write functional chord symbols with accidental roots, basically claims that (and I paraphrase) "#i is not a thing" in functional harmony. But why not just call a spade a spade, so to speak. If the chord is built on the raised tonic, why not call it #i, which is perfectly cle...

HSM
HSM
06:24
1
Q: When was the study of automorphic (and in particular modular) forms become "adelized"?

Anton HiladoThe theory of automorphic forms is stated in modern language as a function on the adelic points of some reductive group satisfying certain properties (see for instance, Chapter 7 of An Introduction to the Langlands Program by Bump et al). This includes modular forms as a special case, whose class...

2
Q: How to eliminate male on male competition?

KirariWhat behavioral and biological changes would be needed to make males not fight each other, basically I trying to make a inverted patriarchy were males are the peaceful and friendly ones and females are the violent and competitive ones?

4
Q: Minimal Definition of "Finite Set"

GaryWalter Rudin's Principles of Mathematical Analysis, page 25 has this definition: For any postive integer $n$, let $J_n$ be the set whose elements are the integers $1,2,\ldots,n$. $A$ is finite if $A\sim J_n$ for some $n$ (the empty set is also considered to be finite) Here $B\sim C$ means ``t...

RPG
RPG
06:53
6
Q: Can Monks Use Dex to grapple and shove under the One D&D Character Origins UA?

J. A. StreichThe new UA makes Grapple and Shove an Unarmed Strike, which makes sense: UNARMED STRIKE An Unarmed Strike is a melee attack that involves you using your body to damage, grapple, or shove a target within your Reach. Your bonus to hit with an Unarmed Strike equals ...

07:33
4
Q: SemanticImport mangles Greek letters in column headers

EtaxonBug persisting through 13.1.0 I have a Dataset whose column headers contain Greek letters. If I export the Dataset as a csv file and then SemanticImport that file, the Greek letters appear incorrectly: data = Dataset[{ <|"\[Epsilon]" -> 1.5, "\[Eta]" -> 1.0, "\[Nu]u" -> 5.3, "\[...

3
Q: Constant of integration for solving differential equation

Daanyal Ali AkhtarAs I am progressing differential equations practice, I found myself at somewhat of a roadblock. The roadblock is essentially that let's say we have the following equation:$$\int x^2\,dx=\int y\,dy.$$Now when we put the constants down after integration, such as:$$\frac{x^3}{3}+c_1=\frac{y^2}{2}+c_...

4
Q: What is wrong with my solution to find the size of an angle of a triangle?

xiver77The sides of a triangle $a$, $b$, and $c$ has the following lengths. $$a=x^2+x+1$$ $$b=2x+1$$ $$c=x^2-1$$ Since $a,b,c>0$, $x>1$. $$a-b=x(x-1)>0\ (\because x>1)$$ $$a-c=x+2>0$$ Therefore, $a$ is the longest side, and its opposite angle $A$ is the largest angle. Let $B$ and $C$ be the opposite ang...

Law
Law
08:04
1
Q: Can one individual (not a dealer) give or sell a firearm to another individual without reporting the transaction?

SomeoneCan one individual give a gun to another individual without filing any paperwork or doing a background check in Oregon? What if the recipient is a minor? What about selling the gun?

08:23
2
Q: How to draw several diagonal squares?

zhenman yuanI'm the beginner in Mathematica Plot, so recently met many situations that I cannot understand. Here is my code for drawing 10 squares across the diagonal line in a square: RegionPlot[{x - y <= 0.1 && y - x <= 0.1 && 0 <= x <= 0.1 && 0 <= y <= 0.1, x - y <= 0.1 && y - x <= 0.1 && 0.1 <= x <...

3
Q: All the ways of writing numbers

GorbitGamesI couldn't come accross any sites where I could get a comprehensive list of possible number writing formats. My question is mainly about mixing and matching different ideas I've seen online. For general, whole numbers, which of these are possible: 一二三万三四五 123万345 百2十3万3百4十5 123345 一二三三四五 For rati...

1
Q: Distribute evenly such that object spacing to page margins = spacing between objects

GeremiaHow do I distribute objects evenly horizontally in Inkscape, such that the spacing between the objects equals that of the left (right) object to the left (right) edge of the page? Similar to this question; cf. this comment

08:58
2
Q: Vectors in a parallelogram

mohamedshawkyI have the three position vectors for the corners of a parallelogram: $\langle 1,1\rangle$, $\langle 4,2\rangle$ and $\langle 1,3\rangle$. The question is asking for the three possible candidates for the fourth point. I drew the three points and deduced that the three candidates are $(-2,2)$, $(4...

1
Q: When creating a bash array using mapfile and parallel, why isn't the array created when used inside a function?

NickotineWhen I use mapfile with parallel to create an array inside a function the array isn't created properly. Why is this? Array creation not in function mapfile -t arr < <(parallel -j 0 echo ::: {1..5}) declare -p arr declare -a arr=([0]="1" [1]="2" [2]="3" [3]="4" [4]="5") Same thing but inside a...

09:25
1
Q: Why is text in an svg rendering incorrectly in Firefox & Safari, but correctly in Chrome?

Mark GavaganI'm saving a vector graphic with text in Adobe Illustrator CC (File > Export > Export as ; format .svg ; Styling: Internal CSS ; Font: SVG ; Images: Embed ; Object IDs: Layer Names ; Decimal: 3 and both Minify & Responsive are checked. On my iMac 27" 5K Retina Monteray (updated), the svg renders...

09:40
2
Q: Percentile of the arithmetic mean of a lognormal distribution

Harvey MotulskyThe arithmetic mean of a lognormal distribution is greater than the geometric mean (which equals the median). So its percentile is greater than 50%. But how much greater? It depends on the geometric standard deviation, which defines the asymmetry of the distribution. What function defines the per...

2
Q: Closed formula for infinite series

Fellow InstituteOfMathophileFor the following infinite series $$\sum_{n=0}^{\infty}\frac{x^n}{n!}\sum_{m=0}^{n+1}\frac{y^m}{(n+1-m)!}$$ Is there any closed expression for this infinite sum in terms of $x,y$? My intuitive thought leads me to power series related to gamma function, inverse gamma function, beta function or Bes...

1
Q: Are chemical equations like a cooking recipe?

Karsten - apprenticeSometimes, balanced chemical equations are compared to cooking recipes. Here is one example: Imagine if you were baking chocolate chip cookies and measured out your ingredients incorrectly. What if you added 2 tablespoons of flour instead of two cups of flour. Or if you added one cup of salt ins...

1
Q: Cantonese Question: When does one use 咩 versus 乜野?

Shawn HemelstrandI've been listening to some Cantonese audio from Pimsleur and noticed they use a different word for "what" compared to what I learned from CantoneseClass101. In CC101, they used 咩, such as "咩事啊?", whereas the audio I just listened to is using sentences like "你想飲乜野啊?" What is the difference if any?

10:09
2
Q: How to make my site reachable by Google without deleting "?" from its URL?

InnarqWhen I pass my URL to the Google Rich Results Test or in Google Search Console, the URL automatically changes. Here's an example: https://example.com/blog/Jak%20zainstalować%20WordPress%20na%20swoim%20komputerze%20na%20localhost%3F/ In Google this automatically changes it to: https://example.com/...

DIY
DIY
1
Q: How to grind exposed edges of bathroom wall tile to fit a recessed medicine cabinet?

AdrienI had a tiler company who has put me through hell and back on multiple occasions with my bathroom remodel. I've had them back here multiple times to fix their screw ups. The next issue I just discovered to add to the litany of problems is that the tile they placed around the recessed hole for the...

10:52
2
Q: Is @AuraEnabled(scope=global) real yet?

BingI'm trying to test out the new scope attribute for the @AuraEnabled annotation that is supposed to be part of Summer '22, but the compiler doesn't seem to recognize it. @AuraEnabled(cacheable=true scope=global) public static void myMethod(){ Anyone had success with it? Reference: https://help.sa...

CS
CS
3
Q: How can the universe evolve unitarily if there's no clock outside it?

Ryder RudeWe say that the wavefunction of the universe always evolves unitarily as everything gets entangled. But there is a huge problem with this reasoning. A clock has to exist outside the universe for us to define unitary evolution of the universe. But there's no clock outside the universe. It is probl...

TeX
TeX
11:27
2
Q: Writing an s-expression with indented lines?

TheProgrammerI'm writing some notes on parsing expressions, and one thing I want to illustrate is prefix notation equations. With this in mind, I want to be able to indent certain pieces of an s-expression. For instance, here's what I'm looking for: (− (+ (∗ 7 −9) (−6 (/ − 32)))) However, I c...

CS
CS
12:14
2
Q: Does the Coulomb's force depend on the configuration of the medium?

AnkitI know that when two charges are placed in a dielectric medium (say water) then the force between the charges get reduced and the force equation is $$F=\frac{q_1q_2}{(4π \epsilon_o \epsilon_r) r^2} $$ But I want to ask whether this force also depend on the configuration of the charges inside the ...

2
Q: How likely will I or my luggage miss a tight Japan Airlines connecting flight in NRT while travelling from Southeast Asia to the US?

BernardI have booked a flight from SIN to LAS, with connections at NRT and LAX, on a single ticket. This is ticketed by American Airlines, but the operating carrier for both the SIN->NRT and NRT->LAX sections is Japan Airlines. My transit time at NRT is exactly one hour, which is tight, and any delay ...

12:31
2
Q: Can I generate multiple random uint6 from a uint256?

Danny BThe chainlink VRF returns a uint256, for my application I need at least a uint6. If I utilize one uint256 and break it up into separate uint6 is that still secure as a source of randomness? Also, what's the most gas efficient way to do this? Really appreciate it.

4
Q: Nipple replacement question

pgee70I am a home bike mechanic and i have build a few wheels already. I have a perfectly good wheel-set I want to replace the nipples on for aesthetic reasons - the wheel is almost brand new. I have a wheel building stand with dial gauges, a digital tension gauge, a good spoke spanner and a nipple dri...

2
Q: On the derivation of confidence intervals for hypothesis testing

amrodsI understand that a 95% confidence interval should contain the value of the population parameter under the null hypothesis 95% of the time. That is, for $H_0: \theta = \theta_0$: $$ \begin{align*} &\Pr(|t| \leq t_{crit}) = 0.95 \text{ under } H_0.\\ \Rightarrow &\Pr\left(\frac{\hat{\theta} - \the...

12:59
1
Q: Is "torture something back" a phrase?

LucyI was watching the Vampire Diaries series and in episode 20 of season 4, Damon says: How hungry does she have to be before we can torture some feelings back into her? I can't get the grammar of this sentence! Is torture something back into someone a phrase? Would you please explain it?

13:20
1
Q: Uncomment a line based on occurrence of a pattern in another line

TexGCI have a file like this: File1: json ABC optype D json XYZ json IJK --DELETE OP_TYPE json IJK I want to uncomment the line starting with DELETE if there is pattern optype anywhere above. Desired output: json ABC optype D json XYZ json IJK DELETE OP_TYPE json IJK If the file doesn't have the ...

2
Q: Wheel building question - spoke lubricant

pgee70I understand that lubrication for nipples is a good idea when building a wheel. Grease ** advantages - sticks around for a longer, prevents corrosion, lowers spoke stiction while building wheel 'dry' bike-chain lube ** dries off to form a film. less corrosion than grease? loctite 243 - medium st...

 
1 hour later…
14:50
1
Q: How to trace a piece of wood with curved edges

BVernonI have a metal bench (like a park bench) with wood around the edges, but the wood is extremely worn and I would like to replace it. Because the top and bottom of the bench is curved, I am going to try to trace the existing wood pieces and use my bandsaw to match. Of course, the existing wood does...

ELL
ELL
1
Q: Is there a name "phobia" for tape measures?

ViviI'm really terrified of tape measures like the yellow metallic one that some people use everyday. When i was younger my dad always told me that i would get my fingers chopped off and my face sliced, I know now that there is a unlikely chance that that would happen, but it still stuck with me and ...

1
Q: How does the path connectedness in a topology book relate to the path connectedness described in a typical vector calculus book?

Beautifully irrational A set $S$ is said to be connected (see [30a]) if any two points in S can be connected by an unbroken curve lying entirely within $S$. Conversely, if there exist pairs of points that cannot be connected in this way (see [30b]), then the set is disconnected. Amongst connected sets we may single ou...

DBA
DBA
3
Q: SQL Server: What's the Difference Between a 'Singleton Lookup' and a 'User Lookup'?

AccidentalDBA_COMicrosoft describes the [user_lookup] counter in dm_db_index_usage_stats as the 'Number of bookmark lookups by user queries.' It describes the [singleton_lookup_count] in dm_db_index_operational_stats as the 'Cumulative count of single row retrievals from the index or heap.' This is not at all ...

15:20
3
Q: Function unbounded on a neighbourhood If limit doesn't exist

greyI came across a corollary which goes as follows: Let $D \subset \mathbb R $. If $f:D \rightarrow \mathbb R$ is not bounded on $N(c,\delta)\, \cap \, D$ for some $\delta$ - neighbourhood $N(c,\delta)$ of c, then $\lim_{x \to c} f(x)$ does not exist on $\mathbb R$. My question is, in this corollar...

15:46
2
Q: What is the event and sample space in this specific probability problem?

piwI have always been taught that probability of an event is defined as $$P(E) = \frac{n(E)}{n(S)}$$ where E is an event, S is the sample space, and n(x) indicates the size of x. Now, let's say I have 5 cubes and 10 balls in a box. If I take one object from the box, then the probability that the out...

16:09
4
Q: Could a very light humanoid creature throw a javelin?

Neutralmouse01My story has a creature that is vaguely humanoid in shape and lives on an Earth-like planet. However, the creature is smaller (dingo-sized) and only weighs around 35 pounds. Like humans, these creatures evolve precise throwing ability for hunting, specifically for larger prey. However, due to the...

1
Q: Printing a c++ struct

user1095108Critique? #include <iostream> #include "boost/pfr.hpp" ////////////////////////////////////////////////////////////////////////////// void print_struct(auto&& s) noexcept { using S = std::remove_cvref_t<decltype(s)>; [&]<auto ...I>(std::index_sequence<I...>) noexcept { ( [&]() ...

16:36
3
Q: Proof of Implicit Differentiation (showing a statement is true)

bio Prove that if $x^2+y^2-2y\sqrt{1+x^2} = 0$, then $dy/dx = x/\sqrt{1+x^2}$. Whilst I have implicitly differentiated in terms of x in order to derive that $$dy/dx = (-x+2xy/\sqrt{1+x^2})/(y\sqrt{1+x^2}-1-x^2)$$ however I am unsure as to what my next steps are. I believe that I will need to rearra...

2
Q: When does a continuous function map loops to loops?

Beautifully irrational Let $X$ be a space; let $x_o$ be a point of $X$. A path in $X$ that begins and ends at $x_o$ is called a loop based at $x_o$. Page-327 , Munkres I have before learned of continuous function presving connectedness and path connectedness, but what more conditions do we need on a function of top o...

2
Q: How will the color of equilibrium-which has equal moles of gasses each side- changes, if we increase system’s pressure

nitsirLet’s assume that we have the equilibrium: $$\ce{H2(g) + Cl2(g) <-> 2HCl(g)}$$ $\ce{Cl2}$ has pale, yellow green in color, and $\ce{HCl}$ has no color. If we add the pressure to the system by reduce its volume, according to the Le Chatelier's principle, there will be no changes in the equilibrium...

3
Q: Can a single iCloud account store WhatsApp backups from two phone numbers?

J4GWe are from the UK and had a phone stolen two days ago, we are in South Africa for another month. The UK network provider is sending another SIM to our UK address as it can’t be activated from abroad. So we have bought a new phone in SA, restored it from an iCloud backup and using a local SIM car...

17:22
1
Q: What is philosopher's definition of Universe? And what is Multiverse?

Ha'PennyAs by definition Universe is collection of every thing in space. So if everything in space is inside universe then why we talk about parallel universes? Wouldn't they be inside the universe by definition? How does term Multiverse really have meaning does it implies we have many other collection o...

ELL
ELL
17:50
2
Q: Accidently or Acidentally?

user516076I saw someone's comment in my Facebook group having a small chat with someone else from the UK and caught this word acidentally. To make sure I didn't mistakenly see this, I should provide this screenshot: This word is not listed in my dictionary app: OALD, but it is, in M-W. However, I see this...

1
Q: How to optimize average rating calculation in a review system?

Sadman Muhib SamyoI'm thinking of a designing a review system (restaurant, hotel etc) where users can drop star reviews. Typically in a such a application, you can see the average rating of an entity along with all the individual reviews of the users. Now, the average needs to be calculated. The approach would be...

2
Q: Manga about the blind descendant of a hero who learns water magic in order to see

TomisinIt's new, as it only has a few chapters so far. It is about the descendant of a hero who is blind, but he has to marry a princess and he learns water magic and they find out he is a prodigy. They later find out that his goal is to use water magic to see. It's very interesting and I hope someone k...

1
Q: Does invoking other contract constructor twice deploys the other constructor twice?

Rishabh RaghwendraI am currently learning Solidity and I have found this example on internet for crowdfunding app in which it calls another contract constructor: // SPDX-License-Identifier: Unlicensed pragma solidity >0.7.0 <=0.9.0; import "hardhat/console.sol"; contract CampaignFactory { address[] public de...

18:08
4
Q: Why "Repeated convergence test failure" disappears in rare cases while occurring in most runs?

Igor KotelnikovI am trying to solve huge ordinary differential equation of second order using ParametricNDSolve. My code worked fine until I moved to a new model of plasma pressure. Now it exits with the following message: ParametricNDSolveValue::ndcf: Repeated convergence test failure at z == 0.00007180340719...

18:48
2
Q: "Regions where pain and delight flow together and tears are the very wine of blessedness"?

FangornFrom The Return of the King, either in the middle or toward the end: And all the host laughed and wept, and in the midst of their merriment and tears the clear voice of the minstrel rose like silver and gold, and all men were hushed. And he sang to them, now in the elven-tongue, now in the speec...

 
1 hour later…
19:49
2
Q: Schrodinger ParametricNDSolve doesn't plot anything

Michael Adrian JavierI've been trying to plot the eigenfunctions of a square well with a quadratic surface. I don't know why, but when I try to plot it, it doesn't plot anything. Here is my code: schrod = ParametricNDSolve[{-1/2 \[Psi]''[r] + r^2 == Ei \[Psi][r], \[Psi][-20] == 0, \[Psi][20] == 0}, \[Psi][r...

4
Q: Official recommendations for how early to reach the airport

Federico PoloniAirlines usually suggest to reach the airport very early in their instructions; of course it costs them nothing to write "you must arrive 3.5 hours early for this internal flight, even if you have already checked in online and have only cabin luggage". Are these times binding in any sense, though...

3
Q: Proving complex inequality

evolhartI am struggling to prove the following complex inequality: $\left | z+4 \right |-2\leq \left | z+2 \right |, \text {where} \:z \in \mathbb{C} $ My thought process so far is to use the triangle inequality for complex numbers: $\\\left | z_{1}+z_{2} \right |\leq \left | z_{1} \right |+\left | z_{2}...

20:14
2
Q: Is there a bug in IsomorphicSubgraphQ?

lichengVersion: Mathematica 13.0 IsomorphicSubgraphQ is used to determine whether a graph has a subgraph isomorphic to another graph. It was introduced by Mathematica 13. But it seems that there is a bug in IsomorphicSubgraphQ. G1 = Graph[ ImportString["W|tNHEpCKoh`@@Po_WHB@CKC?WGO{G?KKCB`?OMG?_y_?Sn"...

4
Q: Common practice for references to oeuvres with multiple titles

john c. j.Many historical oeuvres are known by multiple names and/or multiple variations of each name. For example: The title of Thomas Malory's Le Morte d'Arthur was originally written as Le morte Darthur, inaccurate Middle French for The Death of Arthur Jeoffrey of Monmouth's Historia regum Britanniae ...

1
Q: Late non provisional submission in the US!

E. SpathariusI submitted a provisional on 8/19/21 and had a few hiccups these past few weeks having me finishing up final touches on the last day to submit my non provisional patent. I had technical issues with the EFS web and a few other things bringing me very close to the time. After several phone calls to...

CS
CS
20:42
2
Q: What's this capacitor?

Bob LevyWhat does the bottom symbol mean on this capacitor? (the "U<" marking) Am I correct reading: B = +- 0.1% tolerance 222K = 222000pF or 222nF 1KV = rated for 1000V Was unable to find any 1KV's on mouser or digikey with that tolerance so am assuming I'm reading it incorrectly.

TeX
TeX
4
Q: How to make vertical line of certain rows thicker in latex tables?

ShaunakPI want to make a table and highlight certain region in it using thick lines as shown below. In my attempt to reproduce the above table, I have used the tabu package to make thick horizontal and vertical lines. However, there's no command in LaTeX to make thick vertical lines spanning given rows. ...

2
Q: Java object oriented code to find points lying in a rectangle

sweet_summer_childI created this short code as an exercise to learn and practice my OOPS. The aim is - given a string of points as x1,y1,x2,y2... figure out how many of them lie inside a given rectangle. Can anyone please point out what things I can improve in this code design and best practices wise. public class...

2
Q: K&R Exercise 1-19. "detab" program that replaces tabs with the appropriate number of blanks

jr.çhåvez__07I am trying to do a few exercises from the K&R book from the first chapter - exercise 1-19. I have to write a program "detab" which replaces tabs in the input with the proper number of blanks to the next tab stop. Assume a fixed set of tab stops, say every n position. Here is what I've written so...

21:13
4
Q: Methane as a lifting gas for medieval airships

FuriousNukefrostArcturusSo, I've read a few posts on this community about medieval airships. What I have seen is so far that, how none of them mentioned about a lifting gas. Lifting gases are hard to get by. Hydrogen and helium are extremely hard to produce/obtain and require technology that is way past medieval levels,...

21:35
1
Q: Will Starship get refueled in Mars orbit?

The Rocket fanThe current plans of Spacex is to have Starship get refueled in LEO and then fly to Mars and refuel it there on the ground. Will Starship also have to get refuel while it is in orbit and Mars on it's return trip?

TeX
TeX
1
Q: Can you make the spacing around \middle separators the same as spacing around array lines?

schuelermineI’d like to generate something like this code’s output: \left[ \begin{array}{ccc|c} 0 & 3 & -2 & 8 \\ 1 & 1 & 0 & 4 \\ 1 & 0 & 1 & 3 \end{array} \right] But by using matrix instead. Unfortunately, this code: \left[ \begin{matrix} 0 & 3 & -2 \\ 1 & 1 & 0 \\ 1 & 0 & 1 \end{matrix} \middle| \begin{...

Vi
Vi
22:19
1
Q: How Can I Rename a Command but Still Use the Original Command

AmarakonI have the following Vim code: function! TabClose(...) if a:1 == "" tabonly elseif a:1 == "left" Tabops Close Left elseif a:1 == "right" Tabops Close Right else execute "tabclose " a:1 endif endfunction command -nargs=* TabClose call TabClose("<...

1
Q: i have a problem in log likelihood which i wrote for custom distribution?

Willy mithi have a custom distribution and data as follow i={42, 180, 35, 392, 63, 230, 112, 281, 42, 28, 42, 120, 148, 16, 310, 28, 68, 336, 21.5, 50, 19, 30, 12, 120, 140, 170, 17, 115, 31, 21, 52, 164, 225, 225, 151, 60, 200, 46, 210, 14}; MO = ProbabilityDistribution[{"CDF", 1 - ((\[Alpha]*E^-x)/(1 ...

4
Q: Numerical issue with CaputoD

S. EulerPlot[{CaputoD[MittagLefflerE[1/2, -t^(1/2)], {t, 1/2}], (-E^t)*Erfc[Sqrt[t]]}, {t, 0, 1}] The two functions are equal, but the graphs are different. What's the problem?

3
Q: While loop not working problem

BrotosI am new to Mathematica ,and I am trying to implement this while loop which adds all odd Fibonacci numbers less than or equal to 2 million but it keeps outputting 0 for sum. Any solutions for that? Here is the code: sum = 0; i = 0; while[Fibonacci[i] <= 2000000, if[OddQ[Fibonacci[i]], s += Fibo...

22:41
3
Q: Grammar of "all's well that ends well"?

lil' barbussyWhat is the grammar behind the phrase "all's well that ends well"? I understand what it means (all is well because it ended well) but could not for the life of me figure out how this meaning is derived from the original sentence. At first glance, it seems to have two verbs, which, as far as I can...

Law
Law
22:53
1
Q: How does multinational criminal copyright infringement settled?

Anon UserLet's say, The plaintiff, lives in the UK and published a literary work (e.g. A Book) The defendant, a corporation headquartered in the US, wilfully infringing plaintiff's copyright worldwide. Criminal copyright infringement involves 4 elements. that a valid copyright; was infringed by the defen...

2
Q: Millay (?) poem about an urban garden

PhilomenaI have a dim but vivid memory of a poem, 95% sure it was by Edna St. Vincent Millay, about an urban garden alive with beauty despite everything that’s gross about it. Toads, fungus, etc. are the vibe. It is NOT “City Trees” but very much in that vein. I also remember longer lines, e.g. more like ...

23:12
2
Q: StringPartition vs Partition and StringReplace vs ReplaceAll

azerbajdzanI am trying to make substitution cipher solver based on quadgram statistics. I am now in doubt about how to store ciphertext - whether in string or in list of characters. I did a little test to compare how fast is manipulation of strings versus manipulation of list of characters. st = FromCharact...

2
Q: How to prove unbiasedness/consistency/normality of an estimator that doesn't have a closed form?

ForceBruMy estimator looks like this: $$ \hat\theta(X) = \arg\max_{\theta} \frac1N \sum_{n=1}^N f(x_n|\theta) $$ Here, $f(x_n|\theta)$ is some arbitrary function: it's not a logarithm, and the sum is not a log-likelihood. I don't think that there's a closed form expression for $\hat\theta(X)$, so I'm usi...

CS
CS
3
Q: Does God consistently accept man’s repentance in the Old Testament?

GremosaJoshua 7:20-21 NASB “So Achan answered Joshua and said, “Truly, I have sinned against the Lord, the God of Israel, and this is what I did: when I saw among the spoil a beautiful mantle from Shinar and two hundred shekels of silver and a bar of gold fifty shekels in weight, then I coveted them an...

ELL
ELL
1
Q: Is it a natural expression to ask 'do you not want to come'?

MichaelWhat I was taught in grammar books or lectures is Don't you want to come? Does the expression below sound natural to a native speaker? Do you not want to come? Is the latter one more informal?

1
Q: Resizing btrfs partition does not do anything

Vincent AdamsSo, I am trying to shrink my partition by 32 G. I run the resize command; ╚> sudo btrfs filesystem resize -32G / Resize device id 1 (/dev/nvme0n1p2) from 465.26GiB to 433.26GiB And as you can see it outputs that it's been successfully shrinked from 465.26GiB to 433.26GiB. However, checking the p...

23:56
2
Q: How are the meanings of "you will" in English formally categorized?

Funny and creative nameAs someone with only my vague instincts as a native speaker to go off of, I would expect the breakdown comes to something like: "You will find that he is not too receptive to this sort of thing", "You will need to figure out another way in", "You will want to be careful about anything getting wet"


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