#include <cstring> #include <map> #include <iostream> #include <fstream> #include <sstream> #include <string> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> #include <vector> #include <filesystem> #include <errno.h> #include <bits/stdc++.h> std::string USERDIR = getenv("HOME"); ...

Is an endgame with Queen and King vs. two Rooks and King a win for the Queen, a win for the two Rooks, or a draw?

Why must the guns of the AC-130 be on the side forcing the plane to circle the target. Would it not be more practical to have the guns underneath the plane shooting downwards?

When someone says ..., thanks. Is it appropriate to respond with sure If so, in which situations it would be OK, and what exactly would it imply?

Let $R$ be a reduced root system, $W$ the associated Weyl group, and $w_0 \in W$ the longest element of $W$. In general $w_0$ admits more than one reduced decomposition into a product of reflections, a number which we denote by $d_R$. Where can one find a list of values of $d_R$ for low-dimension...

I'm building an artificial growing environment for a heavily overpopulated world (because you can always build up, right?). When I started thinking about this, I thought it might be as simple as "calculate the energy output of the sun for the growing season of wheat...." But as I thought it throu...

Are blindfold chess games playable for chess world champions and grandmasters? Does the ability to do so show mastery for a player? Blindfold chess is, without looking at board, the player will just say the move. Is this possible for a human? For example, the moves 1. e4 e5 2. d4 d6 and so on. T...

As a follow up to this question. When the greatest wizards of all time decide to retire, they place great pride in creating an Artifact encompassing their life's work. Schwarzschild's staff of miniature black holes would be a subject of study and used quite often and recharged between uses(as per...

I have a lot longtables in my work and I figured it out that ONLY the first row of the first column is indented. It doesn't occur in the rest of rows. I saw that with another type of tables (like tabular), that are smaller, my problem doesn't occur. I was searching how to fix it, I found this pos...

Alice and Bob are going on a game show as partners. In this game, there are three doors, which contain a car, the car keys, and a goat, which are arranged randomly and secretly behind the doors. Alice will go onstage first and open two doors and then shut them, while Bob remains backstage in a so...

I have a current gypcrete-over-radiant-over-foamboard-over-slab floor in my unfinished basement. I'm about to frame it out to finish it. I've already located all the tubing, and I do have spots where I can nail or screw most of the walls down. Three questions for the experts: If I want to use po...

I'm a PhD student and use Github to track and share code for nearly all of my research projects, most of which are largely coding-based work in the field of remote sensing. Our lab is discussing how to best keep track of all the software related projects we do. I generally start and manage projec...

This question arose while researching Galois groups of random reciprocal polynomials. Throughout $A_n$ is the alternating group. Let us define the following group action of $A_n$ on the vector space $\mathbb{C}^n$ $$\sigma \circlearrowright (x_1,\dots,x_n)=(x_{\sigma^{-1}(1)},\dots,x_{\sigma^{-1...

I am a student and trying to understand the MOS transistor. So I have simulated the transfer curve of a MOS in Cadence and done a parametric sweep for WL (500n, 1000n). Here you can see the plot sqrt of the transfer curve Vgs/Id. (Level 1 Model) If I change to a level 49 model in Cadence the cur...

A total of 15,799 Chinese officials were punished in July for violating frugality rules, the top anti-graft body said on Thursday. https://www.shine.cn/news/nation/2008285032/ What does the term "frugality rules" mean?

My character currently has a necklace of fireball with 4 beads remaining. Can I split the necklace and hand the beads out to my party for individual use, or does the necklace have to remain whole until just before a bead is thrown? We are about to fight a difficult enemy, and the idea of bombardi...

Here's a recent Microsoft article claiming, "Windows 95 was launched on August 24, 1995". https://blogs.windows.com/windows-insider/2020/08/24/looking-back-the-25th-anniversary-of-windows-95/ But I distinctly remember thinking that it was late, back at that time. It had always seemed like a lot o...

OAM (Orbital Angular Momentum) Multiplexing is a form of multiplexing capable of high data speeds on limited bandwidth using the physical properties of EM waves. An experiment in 2012 transmitted two data signals simultaneously on the same frequency over a distance of 442 meters on the 5ghz band....

I'm trying to understand the ZFC axioms and I understand most of them except the axiom of regularity. From what I understand it is saying that for all non-empty sets that have a set for an element the set does not share any elements with the original set and the element of the set. However would...

A famous problem asks whether an 8x8 chessboard with two opposite corners deleted can be tiled with dominoes, where a domino is a rectangle congruent to two adjacent squares of the board. Now, let C be an 8x8x8 cube with two diagonally opposite corners removed. For which integers $n>1$ is it poss...

Xanathar's Guide to Everything includes this fun magical armor variant, Cast-Off Armor, which can be doffed in a single action (see XGE p136): You can doff this armor as an action. This is generally simple to understand and use, until we get to Warforged (from Eberron: Rising from the Last War)...

Forgive me if I'm not using the correct terminology here but I'm on a Juniper MX204 router, call it router A. I'm receiving full table from my ISP. I do a show route, i.e. show route 1.1.1.1 and I get one prefix back. show route 1.1.1.1 inet.0: 811234 destinations, 811234 routes (811190 active...

The textbook I am using to teach Calculus I includes in the exercises of most chapters a number of interesting real-world applications of the concepts from that chapter. However, the chapter on the derivative of the natural logarithm is remarkably abstract in its exercises. Are there not scenario...

This device has 8 drain channels, shared source, and a single shared gate: DMN1250UFEL How is this different from tying all the drains together and using a single FET? I suppose you could have different drain voltages, but what might be a real-world application?

I love Lie groups actions! My contact with this topic occurred in the context of differentiable manifolds and riemannian geometry courses, and while studying Klein geometries. My knowledge is still very limited, though. I would like to specialize on a research area in which I could work a lot wit...

Is it possible to find a positive measure $\mu$ such that $\forall x\in\mathbb R,\mu(x)>0$ and $\mu((0,1))$ is finite? I'm quite sure that such a measure does not exist, but I'm having some difficulty demonstrating it. Can anyone help me? Thanks in advance.

everyone. I'm having a very difficult time understanding conditional statements, and was hoping someone could help me understand them. I took discrete math this last spring and remember struggling with them, but at some point had to let go and just say "it is what it is, I guess." I'm now taking ...

I wrote some code to get 3 integers from the user. The code then prints the sum of the 3 integers. The code works as expected. I want to validate all input before doing the calculation. However, the code just doesn't feel right. Is there another approach I should be taking? It seems.. redundant. ...

I was surprised in working on a Blender problem recently to find that matrix multiplication doesn't seem to be distributive: >>> bpy.data.objects["Camera"].matrix_world Matrix(((0.7071065306663513, -0.5, 0.5000001788139343, 11.922225952148438), (0.7071070075035095, 0.49999985098838806, -0...

My prefix lets us open doors. My suffix is crucial for doors. My infix is where we get pork. My whole is why pianos work.

Is there any benefit to using swept wing at subsonic speeds? (By the way..Why do some fast birds like falcons, swifts and most migratory birds use swept wings or raked wingtips since they fly at low subsonic speeds?)

To wit, to what extent did statistics professors study Mathematical Logic ("ML" henceforth)? To what extent does Statistics use ML? How relevant is ML? I'm not referring to transitions or introductions to proofs like A Logical Introduction to Proof, Introduction to Mathematical Structures an...

Below is the implementation for the Floyd-Warshall algorithm, which finds all-pairs shortest paths for a given weighted graph. The function floyd_warshall takes a graph as an input, which is represented by an edge list in the form of [source, destination, weight] The path_reconstruction function ...

The default application for xcf is krita, not gimp. How do I change this? I see this in the MIME Type Editor: Edit:

I encountered the word here: 世界で色んな人が食べ物がないから、食べ物を捨ててはならない!と子供の頃から両親 が教えてくれた。 and the 'adjectival' definition in https://jisho.org/search/%E8%89%B2%E3%82%93%E3%81%AA

I'm building up a 36-spoke dynamo front wheel for a Mongoose Envoy cargo bike. It will be used casually for short trips, but I weigh 230 lbs and I may have a child or a load of groceries on. The stock tires are 60mm wide. I have a 25mm wide, aluminum rim from an old Mongoose mountain bike, howeve...

Reading 1 Samuel 2:8, it seems to suggest that the earth has pillars. Can anyone explain please??

It takes 9 calories to burn 1 gram of fat. 4 calories to burn 1 gram of carbs, or protein. Are these numbers exact, or have they been rounded? And if they have been rounded what are the exact numbers? One hit said that the numbers are rounded, but not with how much.

Is there any reason why we don’t supply power to a 2.5 or 3.5 jack or why it hasn’t evolved to be used it as a wall outlet protocol? It seems it would use less space, easier to use (can’t insert it incorrectly), and disconnects more easily.

Is a bird with venomous claws possible? I want it to jump on people and scratch at their heads while they’re walking as a mating ritual. However, they need to be venomous for plot related reasons.

My friend want to apply for UK visit visa. But he doesn't have certificate. Could it affect his visa application

It is said about ozone a layer in the earth's stratosphere at an altitude of about 10 km (6.2 miles) containing a high concentration of ozone Over the Earth’s surface, the ozone layer’s average thickness is about 300 Dobson Units or a layer that is 3 millimetres thick. (nasa) So, how does the...

Rather embarrassingly, I have been coding for some years now, however I feel that I still write code in a very basic way. It is hard to be certain, when many companies often give coding interviews for free labour, and the internet rarely sees software development from a business side but treats i...

I came across this question: Suppose we are giving two students a multiple-choice exam with 40 questions, where each question has four choices. We don't know how much the students have studied for this exam, but we think that they will do better than just guessing randomly. a: What is our likelih...

Hey so I've been in music for about 7 years now and it's gotten to the point where I've developed actual skill. I principle French Horn and second Trumpet (with self taught guitar on the side that started during quarantine) and I'm in High School currently. I remember that when I was "auditioned"...

Can a process background itself? What would be a Perl and/or C implementation of this?

The simple way to do this would be to convert the base 2 number to base 10, then convert that base 10 number to base 4 to get the answer. However, I think that there might be an even better way to do this, because 4 happens to be 2*2, but I can't seem to pinpoint it. Can somebody please point me ...

I'm writing a passion program that will determine the best poker hand given hole cards and community cards. As an ace can go both ways in a straight, I've coded this as [1, 14] for a given 5 card combination. I understand recursion but implementing it is a different story for me. I'm looking fo...

Given that $y=\frac{1}{2} e^{2 x}+\left(x-\frac{1}{3}\right) e^{x}$ is a special solution of the differential equation $y^{\prime \prime}+a y^{\prime}+b y=c e^{x}$ (a, b, c are constants), I want to find the value of a, b, c. y[x_] := 1/2 E^(2 x) + (x - 1/3) E^x SolveAlways[(D[#, {x, 2}] + a*D[#,...

I am wondering how a helicopter manages to stay balanced and stay in one spot while it is in the air. I understand that there is a second rotor that is used to counteract the angular momentum and also the use of swashplate to direct the helicopter forwards and backwards. Assuming the angular mome...

Problem Statement: You will receive a substring of a palindromic string. You must return the index of the substring which marks the point of reflection of the original string. You are only provided the substring, which is not necessarily a palindrome because it is not necessarily centered about t...

It shows only date, hour and miniutes such as 11:41 PM, 8/20/2020. I would like to see the 'seconds' always on the task bar.

Let $p>3$ be a prime. We set $R=\{x\in\mathbb{Z}: (x/p)=1\}$, where $(\cdot/p)$ is the Legendre symbol. When $p\equiv3\pmod4$, by class formulae of imaginary quadratic fields $\mathbb{Q}(\sqrt{-p})$, we can easily obtain that $$A_p:=\sum_{0<x<p/2,x\in R}x=(p^2-1)/16,\ \text{if}\ p\equiv7\pmod8,$$...

The answer is a pair of words.

Problem Need to figure out how to install Salesforce EDA through Salesforce CI in a Scratch org by running sfdx force:package:install so that CI tools can automatically test packages dependent on EDA by installing EDA through Salesforce CLI first. Workaround A known functioning workaround is to i...

Many ancient pali literature proposed the end or nirvana as 'tathagata got released'. What does it mean? Do tathagata is bound? Or Do we bound by ignorance and free with right knowledge(Samma Ditthi)? Samma Ditthi at times coincides with Thou are that, upanishadic dictiom. Five aggregates are mer...

So I went to a bike shop to check out the options that I could buy and came across this board that has the gear using system explained for beginners (I guess?). Is it not literally suggesting cross-chaining? The bike I'd most likely buy will have Shimano tourney derailleurs, both front and back....

I'm just typing this up for class and I'd appreciate some guidance like what packages I'd need and how to start?

I want to use a DAC to control the current to a Peltier device. The Peltier will typically be running at about 0.25A, and this requires less than 100mV. I have tried this circuit, but it oscillates at about 100KHz. The Op amp is fed from a separate 3.3V power supply. The darlington has an Hfe of ...

Using the following code, how can I fill this closed area with a pattern saved in an outside file as the enclosed one. \documentclass{beamer} \setbeamertemplate{navigation symbols}{} \usepackage{tikz} \usepackage{pgfplots} \begin{document} \begin{frame}[t] \frametitle{} \begin{tikzpicture}[scale=...

I belong to a few off-road bicycle in groups. We ride during the day and at night. Does anyone know of a smart phone app that would alert the bicycling group leader when one of the group is left behind, meaning when they are more than certain distance far away?

When a human being dies, his body dissolves into other bodies, i.e other humans, plants, air, water, rocks, sand etc. But what really happens to our Consciousness memory thoughts intelligence & Karma

I noticed US President Trump held an Republican National Convention event at the White House the other day. Is it not illegal, and unprecedented, for the President to use the White House - a federal government installation - in that way?

I wonder if the location of Rivendell is a secret known only by the wise such as Gandalf, or is it public to almost everyone in Middle-earth? As seen in the movie, Gandalf leads Blibo Baggins and the Dwarves through a narrow tunnel to escape from Orcs, none of them recognized that they were on th...

I am new to this but from my initial project requirements, I will need to join GPS Module and RFID Module to a Raspberry Pi 4. Do the GPIO pins support the required output? Is there any guide on how to join two modules to Raspberry Pi?

I am developing an Android app and I need chess pieces images for my it. I am concerned about copyright issues as well. I can copy images from other chess apps on GitHub projects, but I am not sure if that is legal. Is there any free source to get images of chess pieces?

I've been playing chess from many years but started playing more from past few month. I only play 3 minute blitz games, have rating around 1350 in chess.com and 1700 in lichess, have played few thousand games till now. I observed that sometimes my brain just doesn't seem to work and am unable to ...

I'm writing a bash script, where I need to check if a folder is empty or not and according to the output I need to run some other commands. I'm working on Ubuntu 18.04.5 LTS. My script: if [ "$(ls -A /mnt/mamdrive/"As Metadata"/)" ] || ["$(ls -A /mnt/mamdrive/"As Video"/)" ]; then echo “copy...

I want to read my first book in multivariate statistical analysis. Are there any suggestions? More specifically the book should contain: cluster analysis, multidimensional scaling, examples from social and behavioral sciences and if it possible, examples in R. Thanks in advance! P.S.: I read th...

While studying probability, I am kind of having difficulties in understanding marginal probability distribution and conditional probability distribution. To me, they look much the same and cannot find the clear concepts of differences in those two probability distributions.

Mutants have X-genes which give them superpowers, but they aren't fully separate from normal humans. In the Days of The Future Past movie, sentinels were targeting even normal humans who had a chance of having the mutant gene passed on to their children, grandchildren, or great grandchildren. Mea...

I know of someone who is currently writing their master's thesis. They will be the single author of the document. Our (german) university requires a statement that says something like 'I wrote all of this thesis myself unless otherwise specified', meaning everything not cited is your own work (Ei...

Consider a circular loop kept in a time-changing magnetic field. We know, via Faraday Law, that EMF is induced across the loop and hence a current appears in the loop. Let there be some Resistance given in the wire. Then heat will appear in the circuit. How does heat energy appear in the circui...

When reading a sheet music there is some specific bow technique that need to be used on some passages, but I wonder when I will need to switch to my regular bow stroke. For example like in "La fille aux cheveux de lin", there is a violin bow technique "Sul Tasto". It was written above the note like

What is the purpose of R3 on the shunt regulator circuit below? I simulated it but even without the R3, the circuit still works:

I have a miniature aloe and while it's been normal for it to flower once or twice a year, this time something new appeared on the stalk: B is what grows normally, A is this weird bean-shaped thing that is a new thing. I tried looking it up and found nothing - is this just the next stage of flowe...

When I configure a hostname on a computer, that I can look up like this: $ hostname example and then ping, or ssh from another computer on the same LAN: $ ssh example user@example's password: Where is my other computer looking up the address for this hostname? Does the former computer register ...

What is the naughty word in the picture above, does it mean something rude such as holy s***? according to the picture of fist nearby.

The Gelfand transform on the commutative Banach *-algebra $L^1(\mathbb{R})$ is just the Fourier transform. Q. What can we say concerning the Laplace transform?!

I'm reading Marcus' Meditations and I notice a dose of subtle criticism directed at rhetoric and poetry. As per Book I Chapter XIV: From the gods I received that ... I was no great proficient in the study of rhetoric and poetry, and of other faculties, which perchance I might have dwelt upon, if...

LEGO™ as a defence against barefoot warriors In the far future, after the collapse of civilisation, there is an ongoing war between two tribes. The tribes have only the ability to make neolithic technology. These are the Barefoots and the Legolanders. The Barefoots are a fierce tribe who never we...

Why is that enveloped viruses can be killed with soap , alcohol ect.,but not non enveloped viruses?Why does just having an envelope makes it susceptible to soap and alcohol?

Here is my little snake game which I made in c++ using the SFML library. The game is very simple. I have also included a screenshot of how the GUI looks. The files which I am loading are 30x30 colored squares. Yellow is the background. Red represents the snake. White is the cherry/fruit/prize to ...

When we think about Newton's 3rd law we assume that a change in action leads to a simultaneous change in the reaction. If there are two objects at a distance and this change happens at the same time at an inertial frame of reference , at one other this change does not happen at the same time. How...

Is there a convenient way to merge two dataframes with respect to the distance between rows? For the following example, I want to get the color for df1 rows from the closest df2 rows. The distance should be computed as ((x1-x2)**0.5+(y1-y2)**0.5)**0.5. import pandas as pd df1 = pd.DataFrame({'x'...

You task here is very simple: Given a positive integer n without leading zeroes as input, split it in all possible ways Examples Input->Output 111 -> {{111}, {1, 11}, {11, 1}, {1, 1, 1}} 123 -> {{123}, {12, 3}, {1, 23}, {1, 2, 3}} 8451 -> {{8451}, {845, 1}, {8, 451}, {84, 51}, {84, 5, 1},...

Can someone help me identify what set these are so I can find the book and my son can build?

Let $a$ and $b$ be positive numbers. Prove that inequality $$\frac{ax+by}{2} \leqslant \sqrt{\frac{ax^2+by^2}{2}}$$ holds for all real $x$ and $y$ only and only if $a+b \leqslant2$ Problem needs to be done using "basic" algebraic methods. I tried expanding this into form $$2ax^2+2by^2-a^2x^2-b^...

Three circular arcs of radius 5 units bound the region shown. Arcs AB and AD are quarter-circles, and arc BCD is a semicircle. I tried to find the answer by calculating the total area of the circle if it was a full one,and then I subtracted the area of the two quarter circles: $\pi 5^2 - 1/4\pi 5...

I need to add well-defined ticks in this range Ticks -> {Range[0, Pi, Pi/6], Automatic} to the following plot This is the code but it is incomplete. Comments and suggestion to solve it Plot[{ 1/2 (1 + Cos[x]^2), Sin[x]^2/(1 + Cos[x]^2) , 1/2 (1 + Cos[x]^2) BesselJ[0, Sin[Pi/3] x]^2, Sin[x...

Cambridge online dictionary pronounces "often" without the "t" but also gives the pronunciation with the t. I checked in many other dictionaries but it is silent. UK: /ˈɒf.ən/ /ˈɒf.tən/ US: /ˈɑːf.ən/ /ˈɑːf.tən/ Some people do pronounce the "t" in often but most of the time it is silent. There ar...

Suppose you have a triangulated region in the plane, the triangulation consisting of $n$ triangles. Take an arbitrary triangle of this triangulation and call it $\Delta_i$ with $1\leq i\leq n$. The neighbourhood of $\Delta_i$, i.e. all the triangles around $\Delta_i$ which share a vertex or an ed...

Because of the Covid19 pandemic many countries have been changing and modifying their entry requirements quite frequently. While these new entry requirements can be verified from the country's embassy, how does one ensure that the airlines have the most accurate information? Contacting some airli...

In my world each person has the ability to call upon the power of a star; using it to further whatever end they’d want—i.e. using the sun’s energy to power a spell. However, they can ONLY call upon the power of the visible stars in the sky and once the stars are on the other side of the planet th...

I have a feeling this must have been asked multiple times, but I just cannot find a solution, or even a questions probably because of difficulty in explaining. We all know that inner join basically gives an "intersection" of two tables. And hence multiple inner joins give the intersection of all ...

Earth orbits the Sun because the Sun's mass curves spacetime. But the Sun is 150 million kilometers away from here; how can mass curve spacetime that it's not actually in? Is that a form of action at a distance?

I have the same problem as in this question, but the answers just circle around how to best use quotation marks. This is fine as long as you actually want a quotation mark. However, I explicitly don't want it. And there is one legitimate reason: I want to display code. Verbatim. Without any chang...

I'm trying to implement a Priority Search Tree(PST) following this note: http://cs.brown.edu/courses/cs252/misc/resources/lectures/pdf/notes07.pdf. For convenience, I copied the related peuso-code here: and the note has also provided an example for creating a PST, I just copied the final tree he...

This question is supplementary to the following LEGO™ as a defence against barefoot warriors One answer suggests making weapons and other artifacts by melting and moulding LEGO plastic (ABS). Is this in fact possible using only neolithic technology? Concerns There are no metal containers during ...

The anthology contains short stories including, "The Enchanted Village" by A E Van Vogt, "All Summer in a Day", by Ray Bradbury, "And He Built a Crooked House", by Heinlein (?), and other great stories, including a story about a political (?) prisoner who escapes and has a chip in his head, and i...

Plagiarism is the reuse of other's materials without proper credit and acknowledgement [1] Credible sources are vaguely defined, but it can be attributed to verifiable facts in the literature [2] I want to ask that, in a situation, when an academician found an "inspiring" idea (not necessarily we...

I have a CASIO SA-75 that has corroded battery terminals. I have tried finding a power supply for it. It is rated for 7.5 volts, but all of the power supplies I found were 7 to 8 volts. Can I run the CASIO on these power supplies without worrying that it will die?

After not programming in c++ for some time, I decided to write an AVL tree implementation to get back in shape (I wasn't that good anyway. Still an amateur). Header File bst.hpp #pragma once #include <iostream> #include <utility> namespace bst { template <typename T> class BstNode ...

After reading Unusual THREADPOOL Waits by Josh Darnell, a Twitter user mentioned there is an undocumented trace flag to prevent trimming idle workers: The idea is that once SQL Server has created enough threads to service the peak workload, it should not then trim worker threads (release them to...

The structures of heroin and morphine are quite similar, with morphine being formed by acetylation of heroin: Why is heroin so much more potent than morphine, when their structures are so similar? What biochemical effects lead to heroin's prevalence as a recreational drug, and consequently, the ...

The point of Shimura varieties, as far as I've understood it, is that for a given Shimura datum $(G,D)$, there exist models, by which I mean that for congruence subgroups $\Gamma$ there exists a Shimura variety $X(\Gamma)$ defined over some number field. Hence we get a action of the absolute galo...

Is it plausible to build and maintain a space program without adding to climate change? While obviously there are larger problems in the near term with respect to climate change, I'm thinking about a slightly longer term context with something like solarpunk. If we could reasonably have clean ene...