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CS
CS
00:08
1
Q: Can the two outputs of MCP6542 comparator be wire OR'ed?

RickyBoyI would like to have the outputs of MCP6542 dual comparator inform that one, the other, or both of comparator A and comparator B is logic high. Can I achieve this with a wire-OR? If not, what external circuitry would be required and why?

RPG
RPG
4
Q: Does Fire's Burn use an Action to activate?

MCGThis question has come up after asking this question earlier. When I use the DnD Beyond app to make a Fire Giant Goliath, I am confused with the use of Fire's Burn. In the 2024 PHB the description says the following: Fire’s Burn (Fire Giant). When you hit a target with an attack roll and deal da...

2
Q: Does this liminf condition imply differentiable a.e.?

Nate RiverSuppose $f: \mathbb R \to \mathbb R$ is continuous and satisfies $$\liminf_{y \to x} \left | \frac{f(y) - f(x)}{y-x} \right | = 0$$ for almost every $x \in \mathbb R$. Question: Does this imply that $f$ is differentiable a.e. (necessarily with derivative $0$ a.e.)?

12
Q: Unable to load Apps Script Web App because of error "vb.X is not a constructor"

HershyWhen loading an Apps Script Web App the console shows the following error: Uncaught TypeError: vb.X is not a constructor This started only this morning (1/15/2025) and has never been an issue before. This also happens across different apps. It will work randomly after a refresh or 2 (or 3...), ...

TeX
TeX
2
Q: Do calculation using property list

xcnI did some calculation using property list and got some unexpected results. As the picture shows, each value is correctly assigned its name(key). But they have the same unit even though I specified the unit parameter in third number of the optional argument in \eval command. Secondly, I didn't pr...

2
Q: Is there a vertex transitive graph whose automorphism group is cyclic?

LisaIs there any vertex transitive graph whose automorphism group is cyclic? Note that the automorphism groups of cyclic graphs are the dihedral groups not cyclic groups. Edit: I should have added that the graph should have more than 2 vertices.

00:11
3
Q: Why this imperfect subjunctive in Lucretius?

BrendanGood morning. I cannot explain the imperfect subjunctive in Lucretius de RN, 3.880. Here is the text, with the preceding line: vivus enim sibi cum proponit quisque futurum, corpus uti volucres lacerent in morte feraeque... I would explain it to myself as a "noun clause," introduced by "ut(i)," a ...

DIY
DIY
00:53
1
Q: How to repair loose house fuse holder with blown fuse stuck in it?

Duane SouthworthI have a blown fuse when I tried to remove it the socket turns with the fuse. How can I remove old fuse and install a new one? I'm in Michigan, USA.

TeX
TeX
3
Q: Label an equation in environment multlined

AkiraI have a tex file \documentclass{article} \usepackage{mathtools} \begin{document} \begin{align} F & =\begin{multlined}[t] H (x) \\ \text{where $H(x) \coloneq G(x)$} \label{eq1} \end{multlined} \end{align} \begin{align} F & =\begin{multlined}[t] H (x) \\ \text{where $H(x) \coloneq G(x)$} \end{...

3
Q: Can I have two different lst styles for lstlisting and lstinline?

jonnybolton16I have set up the listings package with some options, but particularly with basicstyle=\footnotesize However, this size is also used for \lstinline, which produces a smaller font size than the regular text. Is there a way I can change the settings for \lstinline? I know I could fix this single in...

01:16
2
Q: What caused fins to be omitted after Saturn 5 designs?

MilwrdfanThis question (Why did Saturn V have fins?) led me to ponder what changed in rocket design after the Saturn V rockets that led to the lack of fins on rockets (at least that I could find) post-Saturn V? I was unable to find other significant examples of rockets that used fins after that time. Al...

DIY
DIY
2
Q: Can I use the base of a cabinet like a baseboard to conceal a flooring edge?

Help-ful-lessI am installing both cabinets and new flooring into the kitchen. The flooring is LVP, and it says explicitly to not place the cabinets on top of it, and to leave a 1/4" expansion gap everywhere. I have seen pictures where cabinets were placed first, then LVP run up to it (leaving a small gap) an...

TeX
TeX
01:39
1
Q: How to label two equations in environment multlined?

AkiraI have a tex file \documentclass{article} \usepackage{mathtools} \mathtoolsset{showonlyrefs} \newcommand{\qtextq}[1]{\quad\text{#1}\quad} \begin{document} \begin{align} F & = A + B \\ & = \begin{multlined}[t] f(x) + g(x) \\ \qtextq{where} f(x) := ... \label{eq1} \\ g(x) := ... \label{eq2} \end{...

8
Q: Shade some squares in the grid

Jack HuThis problem is from USAMTS 2024 round 3. The solution is provided on the website, but it doesn't show how to obtain that solution, which is what I am really interested in. In a Markdown Table (with 0 representing an empty square): 1 2 3 4 5 6 7 8 9 10 0 0 0 0 0 0 0 0 0 4 0 0 0 6 0 0 6 ...

02:00
3
Q: Short story, possibly a snippet from a book, about a man in a plane crash who is transported to a different world

NathanI read this story possibly in a Breakaway magazine (Focus on the Family's teen magazine for guys) back in the mid-late 2000s (same era that followed the Left Behind hype). This young man was on a plane that had crashed and everyone on board perished, but he didn't realize this because he had been...

2
Q: What data fields you get with Favero Assioma DUO versus UNO?

TortoiseI have ridden off and on for a good portion of my life. I'm 55 now and have two young children so my riding time is limited. I'm considering getting a power meter. I'm really looking at the options from Favero Assioma. I've been looking into the pros and cons of a single-sided versus dual-sid...

TeX
TeX
4
Q: How to access the calligraphic letters of the newpx package?

AndréCThis question is a follow-up to this one: How to access the calligraphed letters from the calligra package? There are two different versions of the capital letter E in this package. They are slightly different from the one in the calligra package. \documentclass[french]{article} ...

02:23
6
Q: Text formatting using std::format for enums

user14530855I need to generate an std::string based on a format string and arguments for that string. I'm using C++20 and in my current implementation I have: #include <format> #include <iostream> #include <string> template<typename... Args> std::string make_str(const std::string& msg, Args &&... args) { ...

3
Q: Industry partner adjunct professors/instructors

Wayne WautersI was wondering if you knew how colleges typically employ industry adjuncts? I ask because we have been approached by a local hospital group about interventional radiology technicians. Those technicians are very well paid in our market and it is difficult to hire instructors/professors to teach t...

1
Q: Strange wavy lines when photographing canvas painting, not always visible?

GeorginaI'm an artist and use my Sony A7iii to photograph my finished paintings to list on my website and on social media. When I'm editing, I'll often see these strange wavy lines. At first they appear to be the texture of the canvas, except that they're wavy and if they were part of the canvas, they'd ...

AI
AI
2
Q: Is there any theory around training a recurrent network on an on-going basis?

DarrenSuppose I have a continuous stream of events - say the price of a stock. If I have a trained recurrent network, then at any point in time, we have the predicted value and the actual value. It seems intuitive that I should be able to use the actual value to train the model on an on-going basis? Ho...

CS
CS
02:44
2
Q: LTC6900 User Manual Operation

Luke StirzingerI am trying to get this VCO working in LTspice, but for some reason, the schematic in the user manual is not working. What am I doing wrong?

2
Q: Have I calculated mAh correctly from my USB current test data?

AndrewI have recently bought an Atorch UD18 USB current tester. I would like to determine the Wh and mAh capacities of a power bank. Of the two, I prefer Wh, but the reality is that mAh is used more commonly. Sigh... I attached a USB power source to the USB-C input, and connected the USB-C output to...

03:08
1
Q: Attempting to bake 3D mesh to 2D plane, but textures bleed & material appears dark

KittyI was attempting to follow this tutorial: https://www.youtube.com/watch?v=Dbw7fybKsrM However, I do not have Substance so I tried to do the baking within Blender and got decently far, I even attempted to make a cage similar to what I saw him do with a Substance feature, and I made some progress, ...

3
Q: Can't plot this piecewise function

Richard Burke-WardI have a function, int1[w] which incorporates two yet-to-be evaluated constants, u a positive real and n > 2 an integer. The function definition is: int1[w_] := Piecewise[{{u*(w - 1/2), w == n/u}}, (1/Pi)*(SinIntegral[Pi*(n - u*w)] + (-1)^n*((u*(2*w - 1)*Sin[Pi*u*w])/(2*(u*w - n))))] I want to...

2
Q: Class = set of naive set theory?

GodCan one say that a class is nothing more or less than what is called a „set“ in naive set theory or would this go to far? AFAIK in naive set theory a set is basically a collection whose members satisfy the predicate $\varphi$, i.e. {x|$\varphi$(x)}, and that is what a class looks like formally.

CS
CS
03:28
2
Q: Identification of SMD 8-pin IC with marking "530?"

Fabián RicaldezThis is the board of a vacuum cleaner. It does not give voltage to the motor, I need to change the Q4 chip but I can't see the complete code. Does anyone have any idea what chip it might be?

Law
Law
3
Q: Can a man adopt his wife's children?

Neil MeyerIf a man marries a woman who has children from a previous relationship. If the biological father does not feature in the childrens lives can the man adopt his wife's children so his all the same rights and responsibilities like it would be if they adopted an orphan together. With the mother's per...

2
Q: Are marital relationships definitely impermanent?

boris moncayoI am a teenager who has had the desire for a long time for an eternal relationship with someone. I usually do a little research into certain philosophies, and enlightenment and related things, but I no longer see hope that my wish is possible, and even though they say that the important thing is ...

04:16
2
Q: Interpretation of “あなたに美世さんを守れる”?

ZorfThe full sentence is: あなたに美世さんを守れるというのですか? What interests me is the use of a “に/を” pattern with potential mood. I had always thought that this was not grammatical. I had indeed always learnt it was not, have even given answers here that asserted that it was not, and have never encountered it be...

TeX
TeX
05:00
3
Q: Drawing a matrix with TikZ using a parametric command

Emanuele NardiHow can I create a LaTeX command that allows me to draw matrices with parameterizable content, configurable colored cells, and customizable cell colors? I would like to define the matrix values, specify which cells should be highlighted, and easily customize the color used for highlighting. The d...

05:42
1
Q: Cofibrant approximations and their relation to classifiying spaces and homotopy colimits

N. PullbackiLet $\mathcal{C}$ be a small category and $\mathcal{M}$ a (cofibrantly generated) model category. The functor category $\mathcal{M}^{\mathcal{C^{op}}}$ acquires a (cofibrantly generated) model structure by taking fibrations and weak equivalences to be exactly those natural transformations such th...

1
Q: Stochastic Dominance for Beta Distributed random variables

Marco Max FiandriIs it possible to prove that a $Beta(\alpha,\beta)$ distributed random variable is always stochastically dominated by a $Beta(\alpha',\beta')$ if $\alpha'>\alpha$ and $\beta'<\beta$? I've read it in an article but I couldn't find any bibliography about. The proof is straightforward whenever $\al...

1
Q: Did anyone get their brain transplanted into an android?

Peter MIn the ST:TOS episode I, Mudd when conversing with Uhura, one of the androids tells her that (paraphrased): We can transplant a human brain into an android body, thus giving you immortality and eternal beauty. This was stated as if it was a fact, and that they had actually previously done this....

Law
Law
06:04
4
Q: Lienholder in PA reporting car as Grand Theft Auto

user55665484375In this hypothetical scenario I'm a lienholder on a vehicle in Pennsylvania due to a seller-financing agreement. Pretend that I sold the car to an individual for an agreed-upon price, and the transaction was properly documented, including a notarized agreement and the retention of a lien on the v...

1
Q: Can one test the view that possibility exists?

user107952This is similar to my previous question, here: How can we test whether other possible worlds exist?. In that question, I asked how we can test whether other possible worlds exist. Now, I am asking a related but different question, as to whether one can test whether (non-actual) possibility exists...

6
Q: As an autistic graduate applicant, how can I increase my chances in interviews?

Question_question1137186218My field is biology and I went to a private school with a good GPA. I have had publications in undergrad and since graduating (2.5 years). I have been working as a lab tech/manager in my field since I graduated. Basically, I have high-functioning autism (diagnosed) and I want to enter grad school...

AI
AI
2
Q: How does AI "consume" water?

Ora G. WaltersThere's been a lot of talk about how much water AI uses. I keep reading that they use it for cooling, but after they do that where's the water going? From my understanding, liquid cooled PCs are fully enclosed not requiring top-ups unless there are leaks. Even if they do flow water in and back ou...

06:28
1
Q: Inadvertently told someone that work is gonna get busier because someone is pregnant

lee grangeI'm a supervisor of a company and inadvertently told someone in a different section of the company that a certain person was pregnant and that work will get really busier for me whan this person takes time off work. This person has found out and made a complaint against me and won't accept my apo...

06:51
1
Q: Difference between using s(x1, x2) and te()/ti() for continous GAM interactions

Christopher RoundsI am curious what is the difference between a GAM using s() or te()/ti() with a continuous interaction? I have seen various CV/SE/blog posts using one or the other. So for example what is the difference between gam1 <- gam(Sepal.Length ~ s(Sepal.Width, bs = "tp") + s...

1
Q: How to work with an Ethereum testnet (sepolia) on a Trezor wallet into Safe Global?

Patrick CollinsI have an Ethereum sepolia account in my Trezor, and I'm trying to use it to create a Safe multi-sig. After scanning my accounts from the Safe UI, I only get my Ethereum accounts. How do I get my sepolia accounts?

CS
CS
07:11
1
Q: How to estimate pull up/down resistors for the digital pins of this IC?

pnatkRegarding this power multiplexer IC's the digital inputs D0 and D1, the input impedance of the D0 and D1 is not given. Only Input current at D0 or D1 is given as 1.4uA. So far I ended with the following wiring for a particular behavior: Is there a way to conclude for pull up and pull down resis...

1
Q: In ibuffer, how can I automatically rename (search/replace) the filename value to make it shorter?

David RLongtime emacs user but still not great at elisp. I use ibuffer and have (setq ibuffer-formats '(... (filename 10 150 :left))) This works but a lot of files I'm working with are pretty far down in the hierarchy so I can't see the whole name. I have some env vars set up in the shell before I ru...

CS
CS
07:33
2
Q: Why is potential energy of a system lowered?

Maanit SinghIn both physics and chemistry I have often heard my teachers informally say. Xyz process happens since it leads to lower potential energy of the system. So the lowering in potential energy of a system seems to be quite a fundamental law of physics with how many processes it seems to explain and h...

07:56
2
Q: How does JPL Horizons know where satellites are?

2080JPL Horizons offers various interfaces to query for ephemeris tables of various artificial satellites. I've read that spacecraft trajectory plans may be submitted in advance, but since actual positions may deviate from these plans especially over time, how (and by whom?) are actual spacecraft pos...

08:43
4
Q: Is the Peter-Weyl theorem true for non-Hausdorff compact groups?

Justin ToyotaThe first section of Coifman and Weiss' Analyse harmonique non-commutative sur certains espaces homogènes is dedicated to proving the Peter–Weyl theorem for compact groups (for a compact group $G$, $L^{2}(G)$ decomposes into an orthogonal direct sum of irreducible unitary representations, with or...

09:51
1
Q: How did different cultures develop different tuning systems?

notduckI am writing an essay on how musical tuning systems developed differently across cultures. Currently I'm looking into how Europe eventually came to the standard 12TET, while there were other systems being developed such as Vincentino's 31TET. I am also looking into the 7 note tuning system of Tha...

CS
CS
10:11
1
Q: Elementary operator acting on the bra in second quantization

Metal StormI am studying second quantization in the context of quantum chemistry. I apologize in advance if this seems basic. Say we are interested in computing the next braket \begin{equation} \langle \text{CS}|\hat{a}_{a\sigma}^\dagger[\hat{a}_{i\sigma},\hat{H}]|\text{CS} \rangle \tag{1} \end{equation...

1
Q: Why Bhagwan take avatar when the adharma crosses tipping point, why he doesn't take avatar in its early phase to eradicate it

CuriousMindAs per general knowledge, removing a problem when it was small was a good idea. Then why Bhagwan wait for the tipping point for the problem to be big and then come as an avatar. What purpose does he solve by this way of solving problems.

10:34
1
Q: How to set correctly a password aging using krb5?

elbarnaI have a Solaris server, it use ldap for user authentication and kerberos for password. The user can change his password, I have only problem with password aging for example: passwd -r ldap -n 12 giovanni Enter giovanni's password: Permission denied This is the pam.conf for passwd passwd auth ...

10:58
2
Q: In the XFS file system, does the ls command (syscall getdents) access the disk, or is there a cached directory structure in memory?

seethroughJust for test, I created and mounted the same XFS file system on two hosts based on a shared device (pmem).Host A created a file in its mounted directory and executed the sync command to ensure that xfs_db can see the newly created inode information. However, this new file is not visible on Host ...

11:19
1
Q: Why do early bombers have cage looking windows?

leoairbusWhy do early bombers like the Junkers JU-87 Stuka, have cage looking windows? What is the reason for this? (Pictures from Wikipedia)

6
Q: Why does `list()` call `__len__()`?

odigityThe setup code: class MyContainer: def __init__( self ): self.stuff = [ 1, 2, 3 ] def __iter__( self ): print( "__iter__" ) return iter( self.stuff ) def __len__( self ): print( "__len__" ) return len( self.stuff ) mc = MyContainer() Now, in...

4
Q: What is wrong with my thinking regard Theorem 5.20 in John M Lee's Introduction to Topological Manifolds?

cricketSuppose: $B$ is closed in $X$ $\iff$ $B \cap X_n$ is losed in $X_n$ for all $n$. Then: $U$ is open in $X$ $\iff$ $X \setminus U$ is closed in $X$ $\iff (X \setminus U) \cap X_n$ is closed in $X_n$ for all $n$ $\iff$ $U \cap X_n$ is open in $X_n$ for all $n$. Suppose: $B$ is open in $X$ $\iff$ $B ...

11:44
1
Q: How can entanglement be essential to quantum algorithms, when in Deutsch the qubits remain separable?

Yuan John JiangMany people say entanglement is essential. For example, the answer to this question seems to say so Is entanglement necessary for quantum computation?. I understand that quantum encryption protocols are more secure if the qubits are not in a separable state. Otherwise, the qubits are confined in ...

12:06
2
Q: ~といい~といい pattern using only one ~といい

RyanI'm familiar with the grammar point ~といい~といい as shown here https://nihongokyoshi-net.com/2020/02/18/jlptn1-grammar-toii-toii/ However I've been encountering in native media a lot recently the use of only one ~といい in situations that seems to fit the ~といい~といい meaning, for example (context - guessin...

DIY
DIY
12:26
2
Q: Purpose of smooth flat bastard file

User1974I inherited a flat bastard-style file that is smooth. What is the intended purpose of a file that doesn't abrade? Scale is in inches. Location: Canada.

ELL
ELL
12:48
1
Q: What does "by" mean in "the school had no one by his name on its roll"?

Kt StudentIn Oxford Learner's Dictionary I found the following example sentence: the school had no one by his name on its roll. The preposition by seems odd here and I would expect "with" instead. Searching across all the sense of the preposition by, I still couldn't find any suitable candidate to plug i...

GIS
GIS
13:12
2
Q: "Geometry Type Incompatibility When Merging Multipart Polygons in SpatiaLite Layer"

GieneI'm working on QGIS with SpatiaLite layers. The geometry of the layer I'm working with is of type "Multigeometry." When I attempt to merge several multipart polygons, I sometimes encounter an error message: Unable to validate changes to HABITATS_POLY layer Errors: ERROR: 6 entities not added - g...

DBA
DBA
1
Q: Why PostgreSQL v10 and v16 have slightly different behavior for pg_dump, and v10's dump SQL gets an error on v16?

MikeWe have a SQL file dumped from PostgreSQL v10 by the following command locally on the host: pg_dump \ "postgres://db_user:db_pass@localhost:5432/database" \ --file "pgsql-dump-v10.sql" \ --format=p --no-owner --no-privileges We copied the dump file to another PostgreSQL of v16, and importe...

GIS
GIS
13:34
1
Q: ogr2ogr erroneously convert bool field into integer field

biwajimaI want to convert a GeoJSON file below into a KML file. I tired with ogr2ogr but it changed the original Boolean field into an integer field. >ogr2ogr --version GDAL 3.4.1, released 2021/12/27 >ogr2ogr -f KML test.kml test.geojson Is there any way to avoid it? Input GeoJSON { "type": "FeatureCo...

TeX
TeX
13:57
5
Q: Using LaTeX3 keys causes issues with nesting and sub-/superscripts

WernerI'd like to add options to a listing function to make them more comprehensive. These include: Setting left/right delimiters (using a delims key; example would be delims = \lbrace\rbrace which sets {...} outside my list) Setting the delimiter size (using a delim-size key; example would be delim-s...

CS
CS
14:17
2
Q: Do Americans have to work two jobs to survive? If so, what is the percentage?

LznI'm very interested in the current TikTok refugee wave, therefore I read this thread on X this morning: [Chinese girl] - Is it true that Americans have to work two jobs to survive? doge] [American A] - Yes [American B] - I work 84 hrs a week [American C] - Lots of us I'm working two right now an...

TeX
TeX
1
Q: Testing for a dash in a token or string with LaTeX3

314159265358979323I want to know whether a string, or token, is either a dash or an underscore. I thought that this would be easy using \tl_if_in:nnTF or str_if_in:nnTF, but both fail. Why do all of the following tests return no? \documentclass{article} \parindent=0pt \begin{document} \ExplSyntaxOn \tl_set:Nn \l_t...

Law
Law
14:40
1
Q: Are AI systems legally required to verify IP infringement?

user1678860So I was trying Microsoft Copilot and it blocked a prompt asking to write a character template based on Diluc from the video game Genshin Impact. When I asked why it was blocked it's because of intellectual property infringement. Is this just a private policy implemented by Microsoft, or they are...

1
Q: Two blocks are connected by a spring; Why does ‘displaced slightly’ in the opposite direction imply ‘displaced equally’ in the opposite direction?

AlwazThe question is as follows: Consider the situation shown in figure (12-E10). Show that if the blocks are displaced slightly in opposite directions and released, they will execute simple harmonic motion. Calculate the time period. In the solution to this question, a presumption has been made th...

1
Q: Is the history of the Reformation taught as a purely theologically motivated event within the protestant churches?

WyrsaMy question is as it is written. Do protestants view the Reformation as primarily religious and theological or do they go into more sociological and historic detail? If so which details and to what degree? I think church history is something christians should know, so I am curious about the prot...

15:04
1
Q: How to solve the Java issue for the cytoscape 3.10.3?

SsongDuring the update of the Cytoscape 3.10.3, I'm in trouble with Java. When I installed the Cytoscape and started the program, I always saw this error message. To solve this problem, I installed the OpenJDK from the adoptium and set the system variable. (The value of the system variable: C:\Users\...

CS
CS
15:46
2
Q: Testing the coefficients of PI controller in time domain

user451625There is an AC representation of PI controller from the manual in the link. I know that a controller is being tested in the time domain. Could you recommend me a test so I could the exactly form the time domain what "P" coefficient I have and what "I" coefficient I have in the PI controller? Upda...

3
Q: How is a non-zero overlap of coherent states consistent with their overcompleteness?

Nic ChristopherI am trying to understand how the overcompleteness of coherent states, $$ I = \int\frac{d\alpha}{\pi}|\alpha\rangle\langle\alpha|, $$ is consistent with a non-vanishing overlap of coherent states, $$ \langle\alpha|\beta\rangle = \exp(-(|\alpha|^2+|\beta|^2 -2\alpha^*\beta)/2). $$ If I consider $$...

16:09
4
Q: Searching Quine's quote about Inferential explosion

koutyIn the Book "Introduction to Logic and its Philosophy", Peter Schotch wrote about what he calls the "loophole in definition of entailment", that a set of formulas Γ for which it is impossible for all formulas to be true on any value assignment entails everything, explode inferentially: The only ...

16:31
4
Q: Polynomially normal binary sequences

Dominic van der ZypenMotivation. When we try to construct a (pseudo-)random sequence $s:\newcommand{\N}{\mathbb{N}}\N\to\{0,1\}$ we often want $s$ itself, and some of its subsequences, to be normal. Question. Is there a computable binary sequence $s:\N\to\{0,1\}$ such that for every strictly increasing polynomial $p:...

Law
Law
1
Q: What is the precise meaning of 'best tariff' in the German Telekommunikationsgesetz (TKG)?

quaragueIf you as an individual customer have a contract with for example a mobile phone operator, some details of the contract are governed by the telecommunicatin law Telekommunikationsgesetz (TKG). Mobile phone operators have lots of different tariffs and which one would work best for a particular cus...

1
Q: What might be the drawbacks of a shark with blades instead of teeth?

IMP9024When looking at different animals, I realised that most animals that use their bites for slicing parts of their prey, like sharks or carcharodontosaurid dinosaurs, have many teeth because it makes it easier to cut. The natural conclusion of this is to have a continuous blade instead of teeth. Wha...

4
Q: The only way of constructing Jacobi fields

一団和気In Riemannian Geometry, Do Carmo gives a way of constructing Jacobi fields along $\gamma(t)$ with $J(0)=0$. But I'm confused with one step of computation. Let $\gamma:[0,a]\to M$ be a geodesic and let $J$ be a Jacobi field along $\gamma$ with $J(0)=0$. Put $\frac{DJ}{dt}(0)=w$ and $\gamma'(0)=v$...

16:53
1
Q: When pushing interleave too far, why do bad sectors occur mainly at the low addresses?

Miss UnderstandsThis lady low-leveled a 20M MFM drive and turned it into a 32M RLL drive by switching the controller. First of all, this is amazing stage magic. If I had known about this, I would have sold RLL controllers with software to reformat them using a debug script to the controller ROM. But my question ...

17:16
3
Q: New Glenn and Starship testing approach differences

Ahmed TawfikSpaceX has been doing suborbital flights with Starship for a while now, and intends to conduct a second in-orbit engine re-light to demonstrate de-orbit capability. Blue Origin's New Glenn has flown once, and achieved orbit in that one flight, without having to demonstrate de-orbit capability. Wh...

TeX
TeX
2
Q: How to define a \Equiv with four lines like \equiv with three lines?

M. LogicHow to define a \Equiv with four lines like \equiv with three lines? It's better to make \Equiv have the same width and height as \equiv. The following picture shows the appearance of \Equiv and \equiv.

17:39
6
Q: uninitialized constant ActiveSupport::LoggerThreadSafeLevel::Logger (NameError)

Rossrails 6.1.7.10 ruby 2.6.6. Just did a bundle update to 6.1.7.10 from 6.1.7.8 Now running the application I receive the following error: /home/cb/.gem/ruby/2.6.6/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:16:in `module:LoggerThreadSafeLevel': uninitialized constant...

CS
CS
18:01
1
Q: Replace the Engine, rebuild, or just put on new rings

Robert S. BarnesI've got a 2006 Mazda MPV that ran without oil for a few minutes and the engine locked up. The engine is noisy and weak but runs okish when cold. Once up to operating temp it visibly burns oil and will die at stop lights. Oil pressure is fine. My assessment without any actual testing is that ...

2
Q: Will the results from two diffraction experiment under exactly the same conditions be completely identical?

WangAtChicagoIf two electron diffraction experiments are conducted under exactly the same conditions and are randomly stopped at the same time, will the results be completely identical? That is, will the diffraction patterns be exactly the same? What about interference experiments? Has anyone conducted such a...

1
Q: Why can't soft body bounce back?

IngeI'm trying to make a gummy bear, but it keeps collapsing, not bouncing back. I've tried with a sphere object and it work just fine. What's wrong here?

CS
CS
18:48
2
Q: Hair Covering and glory of a man and woman with hair

Michael Was Paul insighting that women should have their head covered with their hair as the covering or they should find something to cover their head with their hair when praying? Is it compulsory that irrespective of ones traditional or cultural practices, one ought to cover their head-hair? 3.Wha...

6
Q: What is the answer to the Kneser–Tits problem over a finite field?

David SchweinLet $k$ be a field and $G$ a reductive $k$-group. The Whitehead group of $G$ is defined as the quotient $$W(k,G) := G(k)/G(k)^+$$ where $G(k)^+$ is the subgroup of $G(k)$ generated by the $k$-rational elements of unipotent radicals of parabolic subgroups of $G$. As far as I know, the original mot...

1
Q: SF movie I saw on TV about 20 years ago: police made by a machine that gives them real tiny heads

EbertsA scene in the movie where the police were being made by a machine that gave them real tiny heads. I thought Stallone or Schwarzenegger was in the movie as the good guy. A futuristic SF movie.

1
Q: AirPods Pro 2 randomly chimes with a blinking LED

Paweł BrewczynskiHere is the video of AirPods Pro 2 randomly chiming https://youtube.com/shorts/Gl6EcS-xFjo?feature=share Please explain what this chime means and how to turn it off

3
Q: Shall Postdoc Contracts Include External Grant Information?

ozgeDuring the past three years, I have held postdoctoral researcher positions at two universities. In my first position, I was informally informed that my salary was partially funded by a research group within the same university. In my second position, I worked on two EU Horizon 2020 projects. Howe...

19:12
7
Q: My supervisor said I didn't have any funding to disclose, but now the funder is upset. What to do?

ozgeI published two articles during my postdoctoral position while being salaried by the university department. My contract did not specify the funding source used to pay my salary. I was only informally informed that a research program led by another department from the same university partially fun...

19:33
1
Q: How safe is it heating a dry glass flask?

TheYoungChemistI’m planning to purify caffeine by sublimation. The most common method appears to be: placing the crude product into a filter flask, securing a test tube on the neck with a vacuum adapter, applying a vacuum, adding ice to the tube and heating on the hot plate. One thing I’m somewhat worried about...

1
Q: What is the actual devil fruit of Monkey D. Luffy?

Trusha JadejaAs the series starts, we're introduced to Devil fruits and we're informed that Luffy's devil fruit is Gomu Gomu no mi (Gum Gum Fruit). Red-haired Shanks himself tells Luffy that he has consumed a Devil Fruit. As the series moves forward, we're introduced to more devil fruits and types of Devil fr...

20:19
8
Q: A professor I don't know is asking me (a high school graduate) to collaborate with them. How to find out if this is legitimate?

FTaI am a high school graduate from Denmark, currently on a gap year exploring research opportunities. Recently, I attempted to add a professor in India (originally from Brazil) on LinkedIn, as I wanted to ask them to review for a journal. They accepted the connection request, said that I have an im...

TeX
TeX
3
Q: babel + bidi: faulty placement of punctuation in footnotes which should use the main language

Ulrike Fischer[no answer needed, I found it while writing the question and will add it myself ...] I have a german text with hebrew paragraphs which in turns contains german footnotes. I get the right placement of the footnotes with the layout=footnotes key but punctuation and superscripts are wrongly places. ...

CS
CS
20:39
1
Q: Why do two electrons having the same spin and position not violate Pauli's principle unless they are in orthogonal orbitals?

Shaurya KadIn quantum mechanical model of atom, orbitals of different shells overlap. For eg- 1s and 2s orbital have high probability density near nucleus. so if both are filled then there is a probability of finding atoms of 2s orbital in region of 1s orbital. Does it not contradict Paul's exclusion princi...

DIY
DIY
1
Q: Is treated lumber required when installing basement walls on top of foam board?

negacaoI am framing my basement with 2x4s and foam board. My plan is to glue 2" foam board to the CMU block walls, and then build 2x4 frames for wiring, rock wool, and to hold drywall. I have read that I should put a strip of foam under the bottom board of the frames - e.g. cut 2x8 length of 2" foam boa...

CS
CS
21:01
3
Q: How can I make an inverter circuit with NPN transistors without voltage drop?

RunsvaI'm attempting to build a DC inverter (NOT gate) circuit with NPN transistors that does not experience a voltage drop on its output. I have a basic understanding of electronics. In the Falstad Circuit Simulator, there is a built-in inverter circuit which behaves as I would expect it to. It prov...

1
Q: Offline installation of YUM and updates from a single system to multiple systems without connecting to internet

praveen hbIs it possible to make 1 IBMi (for example Development LPAR where the updates will be tested or YUM installation will be done by connecting to the internet) system as a key system where the update will be installed and tested. Upon successful testing in that system, this needs to be transferred t...

4
Q: Cite a Theorem as a Lemma

nogrodrigoIf I'm writing a paper to prove Theorem A and I need a specific lemma that I found out to be already proven as Theorem B in some source, should I cite it as a Theorem (as it was originally proposed) or can I cite it as a Lemma as I only need it as an intermediate step?

2
Q: How do I test if a histogram with few bins is obtained from a normal distribution?

Daigaku no BakuSuppose I have a histogram showing the number of students who have successfully finished $0, 1, 2, ..., n$ courses. The number of students is high, but the number of courses is low (e.g. 6). My null hypothesis $H_{0}$ is that a student's "aptitude" is a single real number having a normal distribu...

21:47
6
Q: Did shevet Levi take the spoils of Egypt, given that they were never slaves?

B''H Bi'ezras -- Boruch HashemB"H Hashem tells Abraham that his children will be afflicted and subjugated, and afterwards go out with great wealth. Rashi says that they shouldn't say that Hashem only fulfilled the promise of being afflicted, but not the promise of going out with great wealth. It seems like the wealth is conne...

CS
CS
22:30
3
Q: SSD1306 Initialisation sequence ambiguity

K_TI am reading through the initialisation sequence of the SSD1306 - this diagram is on page 64: I will use I2C to implement this protocol. There are a few cells which are a little ambiguous which I was hoping someone here know a little about - for instance: Set MUX Ratio A8h, 3Fh: what is the 3F...

4
Q: Evaluating an Integral Involving Laguerre Polynomials and Bessel Functions

PhysicistSAIn a physics problem, I encountered the following integral: $$\int_{0}^{\infty} x^{m+1}e^{-\alpha x^{2}}L_{n}^{m}(2\alpha x^2)J_{m}(\gamma x)dx.$$ I noticed that in Integrals and Series by A.P. Prudnikov, Yu.A. Brychkov, and O. I. Marichev (e.g., on pages 2-461 or 2-474), there are similar integr...

TeX
TeX
2
Q: Nested enumerations with `\theenumi`

TommiieI want to implement a custom enumeration list using the following code: \documentclass{article} % Create a custom list. In the actual project, the Alph will be made in small caps. \usepackage{enumitem} \newlist{variations}{enumerate}{2} \setlist[variations]{wide} \setlist[variations,1]{label=\Al...

2
Q: A reference request for quasisimple groups being one-headed.

ShaunDefinition 1: A group $G$ is quasisimple if it is perfect (i.e., $G=[G,G]$, its derived subgroup) and $\operatorname{Inn}(G)$ is simple. NB: I know that $\operatorname{Inn}(G)\cong G/Z(G)$. Definition 2: A group $G$ is one-headed if it has a proper normal subgroup that contains every proper norm...

22:54
2
Q: Do Italian residents (for study purposes) have to get work authorization for a visa in Belgium under 90 days?

realanalysisbetaI've recently been offered an internship for under 90 days at a private company in Belgium. I want to ask whether I am able to work in Belgium as an intern for under 90 days based on my current Italian permit of stay (permesso di soggiorno) which was issued for me to study in Italy. I am a non-EU...

3
Q: Why think of the Aeolian mode as an altered *major* scale?

PerdendosiI'm working through the book The Musician's Guide to Aural Skills: Sight Singing, by Murphy, Phillips, Marvin, Clendenning (Third Edition), which in general I am finding to be excellent, but something strikes me as curious: At the end of Chapter 5, a short summary of each of the Dorian, Phrygian,...

23:19
1
Q: create PPA for Debian distro

morgwaiMy goal is to publish my Debian trixie source package somewhere. I attempted to dput it to my Launchpad PPA, but I got an email saying Unable to find distroseries: trixie Is there a way to fix it or are Launchpad PPAs for Ubuntu only?

7
Q: Does Larry Correia have any history with George R.R. Martin?

Skooba - Stands Against AIIn his latest book Heart of the Mountain, Larry Correia wrote a dedication: To George R.R. Martin. See? It's not that hard" This seems to be mocking George in the length it has taken to publish The Winds of Winter. Do Larry and George have a history together to explain why Larry would make suc...

1
Q: Why can a 21st century Earth determine that crude oil is made from humans?

Dmyt21st century Earth is littered with portals leading to alternate Earths. For reasons, Earths that invent the internet or an analogous equivalent that allows instantaneous mass communication at a global scale has these portals suddenly appearing. A portal leading to a planet where every ocean is f...

4
Q: What is the point of unbiased estimators if the value of true parameter is needed to determine whether the statistic is unbiased or not?

MetamisaThe definition that I have for an unbiased estimator is: "A statistic used to estimate a parameter is an unbiased estimator if the mean of its sampling distribution is equal to the value of the parameter being estimated." I know how to determine whether or not a statistic is an unbiased estimator...

23:42
5
Q: What is the Parker Solar Probe’s speed measured relative to?

OrangeBunnyThe Wikipedia article on Parker Solar Probe states "At its closest approach in 2024, its speed was 690,000 km/h (430,000 mph) or 191 km/s, which is 0.064% the speed of light. It is the fastest object ever built on Earth.” On the discussion page someone asked “Shouldn't the speed of the probe be e...

1
Q: Would a transfer vehicle for future missions beyond low earth orbit need any protection from space debris?

Kasie ReamI know the ISS has a triple shield for protection from anything too small to track. But it's within the low earth orbit cloud of debris. I presume any kind of junk isn't an issue beyond low earth orbit. Is this true?


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