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General Q&A about all branches of theoretical and applied mathematics, including closely-adjacent sciences where the central question is about the math.

336 posts   RSS
Activity Age Score Random
Filters (None)
60%
+1 −0
How do I unambiguously define the facial circuits in a $2$-cell embedding of a graph into a surface?

0 answers  ·  posted 5d ago by The Amplitwist‭  ·  edited 2d ago by The Amplitwist‭

topology graph-theory
60%
+1 −0
Defining the two universes from Calculus of Constructions in LF

0 answers  ·  posted 1y ago by user205‭  ·  edited 1y ago by user205‭

type-theory logic
60%
+1 −0
Proving that this relation implies another relation on the Coxeter group [4,3,3,4].

0 answers  ·  posted 9mo ago by WheatWizard‭  ·  edited 9mo ago by WheatWizard‭

group-theory coxeter-groups
60%
+1 −0
Considering the "type" $\Pi x:A.\Pi y:B(x).Type$

1 answer  ·  posted 1y ago by user205‭  ·  last activity 10mo ago by Dan Doel‭

type-theory logic
57%
+2 −1
Strange behavior in elections and pie charts

2 answers  ·  posted 7mo ago by TheCodidacter, or rather ACodidacter‭  ·  last activity 3mo ago by Agent Smith‭

probability
57%
+2 −1
Third kind of infinite

1 answer  ·  posted 2y ago by Estela‭  ·  last activity 2y ago by r~~‭

set-theory
57%
+2 −1
If $n = xm$ and $n \rightarrow \infty$, then $m \rightarrow \infty$?

1 answer  ·  posted 3y ago by TextKit‭  ·  last activity 3y ago by The Amplitwist‭

calculus
57%
+2 −1
difference between quotient rule and product rule

3 answers  ·  posted 3y ago by deleted user  ·  last activity 3y ago by msh210‭

calculus quotient-rule product-rule
57%
+2 −1
Equation of a line given some parametrized points on it and an area

1 answer  ·  posted 3y ago by msh210‭  ·  last activity 3y ago by msh210‭

high-school-mathematics coordinate-geometry
57%
+2 −1
Why rational to be indifferent between two urns, when urn A has 50-50 red and white balls, but you don't know urn B's ratio?

2 answers  ·  posted 3y ago by Chgg Clou‭  ·  last activity 3y ago by celtschk‭

probability
55%
+3 −2
Intuitively, why doesn't picking unpopular integers ($> 31$) lower your probability of winning lotteries?

1 answer  ·  posted 9mo ago by Ethen‭  ·  last activity 9mo ago by Derek Elkins‭

lottery
54%
+4 −3
Is it worth it to replace Arabic numerals with Kaktovik numerals?

1 answer  ·  posted 1y ago by GoldenGold‭  ·  last activity 1y ago by DavidCary‭

Kaktovik numerals
50%
+0 −0
What is the parallel for edges?

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by r~~‭

geometry terminology
50%
+0 −0
Universal property of quotient spaces

2 answers  ·  posted 1y ago by Snoopy‭  ·  last activity 12mo ago by ronno‭

topology
50%
+0 −0
Finding a quadratic that has solutions to given values

1 answer  ·  posted 1y ago by brah‭  ·  last activity 1y ago by trichoplax‭

algorithm approximation numerical-analysis
50%
+1 −1
In general, does $\color{forestgreen}{P(A|M)} + \color{red}{P(B|M)} = 1$?

1 answer  ·  posted 2y ago by DNB‭  ·  last activity 2y ago by whybecause‭

probability
50%
+1 −1
Acceptable, usual to write $\ge 2$ pipes simultaneously?

1 answer  ·  posted 2y ago by DNB‭  ·  last activity 2y ago by Derek Elkins‭

probability
50%
+0 −0
How does $P(C > D \mid C = 2) \neq P(C > D \mid C \neq 2)$ prove that B > C depends on C > D?

0 answers  ·  posted 2y ago by DNB‭  ·  edited 2y ago by DNB‭

probability
50%
+0 −0
How can I justify whether I'm able to apply the Gaussian elimination method to this system?

1 answer  ·  posted 2y ago by dumplings‭  ·  edited 2y ago by Peter Taylor‭

equation system gaussian
50%
+0 −0
Is there a way to encode a unique arrangement of vertices of a graph with a unique short word?

2 answers  ·  posted 1y ago by Carefree Explorer‭  ·  last activity 1y ago by celtschk‭

graph-theory
50%
+3 −3
Isn't "any, some, or all" redundant? Why not write just "any"?

1 answer  ·  posted 2y ago by Chgg Clou‭  ·  last activity 2y ago by Tim Pederick‭

terminology
50%
+0 −0
What are the 2 arithmetic means of $x + y$ and $4x - 2y$?

2 answers  ·  posted 2y ago by General Sebast1an‭  ·  last activity 2y ago by General Sebast1an‭

arithmetic sequence mean
50%
+0 −0
"the people who move have a percentage of Democrats which is between these two values" — How does this furnish intuition for Simpson's Paradox?

0 answers  ·  posted 2y ago by DNB‭  ·  edited 2y ago by DNB‭

probability
50%
+0 −0
Sample skewness consistency [closed]

0 answers  ·  posted 2y ago by Guilherme Costa‭  ·  closed 2y ago by Peter Taylor‭

skewness statistics
50%
+1 −1
How to deduce which ETF is redundant? a of ETF1's holdings in ETF3, a of ETF2 in ETF3, b of ETF1 are in ETF2, b of ETF2 in ETF1.

0 answers  ·  posted 2y ago by Chgg Clou‭  ·  edited 2y ago by Chgg Clou‭

finance
50%
+0 −0
A discrete-time queue Markov Chain problem

0 answers  ·  posted 2y ago by Joe‭

Markov-chains
50%
+0 −0
Why does the Dottie number $=\sqrt{1-\left(2\text I^{-1}_\frac12\left(\frac12,\frac32\right)-1\right)^2}$?

0 answers  ·  posted 2y ago by Tyma Gaidash‭  ·  edited 2y ago by Tyma Gaidash‭

probability equation median inverse
50%
+3 −3
Defining Bayes’s theorem from scratch in ZFC

1 answer  ·  posted 2mo ago by Julius H.‭  ·  last activity 16d ago by xamidi‭

set-theory zfc bayes-theorem
50%
+1 −1
Explain derived categories to someone without a strong background in homological algebra [closed]

0 answers  ·  posted 2mo ago by Julius H.‭  ·  closed 2mo ago by Peter Taylor‭

category-theory
50%
+1 −1
What are the “increasingly stable consequences of the large cardinal hierarchy”?

0 answers  ·  posted 2mo ago by Julius H.‭

set-theory
50%
+0 −0
Calculation of limit

0 answers  ·  posted 6mo ago by Klein Moretti‭

calculus analysis limits applied-mathematics
50%
+1 −1
Prove that $\forall x\in\Bbb R:\lfloor x^2\rfloor-\lfloor rx\rfloor\ge-1\iff|r|\le2$.

1 answer  ·  posted 18d ago by TheCodidacter, or rather ACodidacter‭  ·  last activity 16d ago by Derek Elkins‭

inequality solution-verification
50%
+0 −0
What was Justice Scalia's mathematical mistake in Penry v. Lynaugh (1989)?

1 answer  ·  posted 3y ago by Chgg Clou‭  ·  last activity 3y ago by Derek Elkins‭

probability
50%
+0 −0
Why mustn't the proportion of smokers among married people be the same as the proportion of smokers in the whole population?

1 answer  ·  posted 3y ago by Chgg Clou‭  ·  last activity 3y ago by r~~‭

probability
50%
+0 −0
Why isn't $\Pr(diseased|+ test) = \dfrac{\text{number of true positives}}{\text{number of false positives}}$?

0 answers  ·  posted 3y ago by Chgg Clou‭  ·  edited 3y ago by Chgg Clou‭

probability
50%
+0 −0
How to intuit : married smokers × all people < all smokers × all married people ?

0 answers  ·  posted 3y ago by Chgg Clou‭

probability
50%
+0 −0
How to quantify "married people are less likely than the average person to smoke", "smokers are less likely than the average person to be married"?

1 answer  ·  posted 3y ago by Chgg Clou‭  ·  last activity 3y ago by thelast19digitsofpi‭

probability
50%
+1 −1
Why can an easily graphable definite integral, be labyrinthine to evaluate?

0 answers  ·  posted 3y ago by TextKit‭  ·  edited 3y ago by TextKit‭

calculus
50%
+0 −0
How's the outcome of airplane crashes almost always certain, but the probability is not? [closed]

0 answers  ·  posted 3y ago by Chgg Clou‭  ·  edited 3y ago by Chgg Clou‭

probability
50%
+1 −1
How can Abraham Wald's approach lead you to ignore crucial features of a problem?

1 answer  ·  posted 3y ago by Chgg Clou‭  ·  last activity 3y ago by JRN‭

intuition
50%
+0 −0
Why paradoxical to accept \$3, and avoid betting on Dushanbe's temperature for a prize of \$10?

0 answers  ·  posted 3y ago by Chgg Clou‭  ·  edited 3y ago by thelast19digitsofpi‭

probability
50%
+2 −2
What story and one-digit Natural Numbers explain Bayes' Theorem chart most simply?

0 answers  ·  posted 3y ago by DNB‭  ·  edited 3y ago by Moshi‭

probability
50%
+0 −0
How can I visualize this Compound Interest Chart with indefinite integrals?

1 answer  ·  posted 3y ago by Chgg Clou‭  ·  last activity 3y ago by r~~‭

visualization
50%
+0 −0
How can I visualize dividing by a fraction as partial and full groups?

0 answers  ·  posted 3y ago by Chgg Clou‭

visualization
50%
+2 −2
What kind of logic does “Logic in the Theory and Practice of Lawmaking” employ?

0 answers  ·  posted 3y ago by Chgg Clou‭

logic
50%
+0 −0
"A occurred" vs. "something must happen"

1 answer  ·  posted 3y ago by DNB‭  ·  edited 3y ago by DNB‭

probability
50%
+0 −0
Book suggestion for Tensor Calculus (Differential geometry)

0 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

tensor-calculus book-suggestion
50%
+2 −2
How can I intuit $\dfrac{a - b}{c - d} \equiv \dfrac{{\color{red}{-}}(b - a)}{{\color{red}{-}}(d - c)} \equiv \dfrac{b - a}{d - c}$?

1 answer  ·  posted 2y ago by Chgg Clou‭  ·  last activity 2y ago by Wolgwang‭

intuition
50%
+0 −0
Prove that $\int \ddot{x}(t)\mathrm dt=v_0 + \frac{F_0}{m}t$

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by celtschk‭

classical-mechanics integration
50%
+0 −0
Is $x=\int \int \ddot{x}\mathrm dx \mathrm dx$?

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by celtschk‭

multivariable-calculus
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