Mathematics

33%

+1 −4

What's mathematically fallacious with Edvin Hiltner's Lotterycodex patterns, to maximize your chance of winning lotteries? [closed]

0 answers · posted 1y ago by Chgg Clou‭ · closed 1y ago by Mithical‭

lottery

60%

+1 −0

Connection between caustics and conjugate points?

0 answers · posted 1y ago by tommi‭

differential-geometry

60%

+1 −0

Proving that this relation implies another relation on the Coxeter group [4,3,3,4].

0 answers · posted 10mo ago by WheatWizard‭ · edited 10mo ago by WheatWizard‭

group-theory coxeter-groups

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

22%

+0 −5

How can school children intuit why over 100, D is larger? But under 100, D% is larger?

2 answers · posted 1y ago by Chgg Clou‭ · last activity 6mo ago by Agent Smith‭

high-school-mathematics

66%

+2 −0

Proving $|{\bf R}^{\bf R}|=|2^{\bf R}|$ using the Schroeder-Bernstein Theorem

2 answers · posted 1y ago by Snoopy‭ · last activity 1y ago by celtschk‭

set-theory

66%

+2 −0

The purpose of logical frameworks in specifying type theories

1 answer · posted 1y ago by user205‭ · last activity 1y ago by Derek Elkins‭

type-theory logic

71%

+3 −0

Prove $e^x \ge x+1 \\\; \forall x \in \mathbb{R}$ using induction

1 answer · posted 1y ago by Carefree Explorer‭ · edited 1y ago by Derek Elkins‭

limits induction inequality solution-verification

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

71%

+3 −0

Finding distance to parabola's focus, given some points

1 answer · posted 2y ago by msh210‭ · edited 1y ago by Peter Taylor‭

geometry conics

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

28%

+0 −3

How do I compare lotteries' chances of winning jackpot, when they differ in the maximum number of plays?

1 answer · posted 1y ago by Chgg Clou‭ · edited 1y ago by Chgg Clou‭

lottery

33%

+0 −2

2 construals "of 100 patients presenting with a lump like the claimant’s in Gregg v Scott, 42 will be ‘cured’ if they are treated immediately."

2 answers · posted 1y ago by DNB‭ · last activity 1y ago by r~~‭

statistics

50%

+0 −0

Sample skewness consistency [closed]

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

skewness statistics

81%

+7 −0

Prove that 49 is the only prime square to be followed by twice a prime square and then a semiprime

1 answer · posted 1y ago by Peter Taylor‭ · last activity 11mo ago by Servaes‭

number-theory integer-sequences

33%

+0 −2

How to intuit, construe multiplicands and multiplicators $\le 10$ resulting from $\dbinom pc$, WITHOUT division or factorials? [duplicate]

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

combinatorics

60%

+1 −0

How $ijk=\sqrt{1}$?

2 answers · posted 2y ago by deleted user · last activity 2y ago by Tim Pederick‭

quaternions

77%

+5 −0

Why can't we conclude the extrema property of a function from its quadratic approximation when the discriminant is zero?

1 answer · posted 1y ago by Snoopy‭ · last activity 1y ago by Snoopy‭

multivariable-calculus derivatives

14%

+0 −10

How can 3/1 ≡ 1/(1/3), when left side features merely integers, but right side features a repetend?

2 answers · posted 1y ago by Chgg Clou‭ · last activity 1y ago by Snoopy‭

arithmetical-hierarchy

22%

+0 −5

If a changes to b, then doesn't a + d = b? Why a(1 + d) = b? [closed]

0 answers · posted 1y ago by Chgg Clou‭ · closed 1y ago by Peter Taylor‭

high-school-mathematics

33%

+0 −2

Why 1. multiply the number of independent options? 2. add the number of exclusive options?

3 answers · posted 2y ago by DNB‭ · last activity 2y ago by Tim Pederick‭

probability

70%

+5 −1

equilateral triangle inscribed in an ellipse

2 answers · posted 2y ago by msh210‭ · last activity 2y ago by Anonymous‭

conics triangle

33%

+0 −2

Intuitively, why can $a, b$ cycle in ${\color{red}{b}} = \frac c{\color{red}{a}} \iff {\color{red}{a}} = \frac c{\color{red}{b}}$?

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

arithmetic

75%

+4 −0

Proving that $p\mid (p+1776)$ if $p$ is a prime and $p(p+1776)$ is a perfect square

2 answers · posted 1y ago by Snoopy‭ · last activity 1y ago by Snoopy‭

number-theory algebra

71%

+3 −0

How to calculate remaining volume of a wire spool

2 answers · posted 1y ago by re89j‭ · last activity 1y ago by Olin Lathrop‭

geometry volume

80%

+6 −0

What is the Name of Function for Probability of a Certain Sum on Random Die Rolls?

1 answer · posted 1y ago by James McLellan‭ · last activity 1y ago by Derek Elkins‭

statistics

60%

+1 −0

Is there a "regular" quasi-convex function $f:\Bbb R^2 \to \Bbb R$ that is not a monotone transformation of any convex function?

0 answers · posted 1y ago by Pavel Kocourek‭

multivariable-calculus real-analysis convex-analysis monotone-functions

66%

+2 −0

ratio of partial sums of the same geometric sequence

1 answer · posted 2y ago by msh210‭ · last activity 2y ago by Peter Taylor‭

geometric-sequence partial-sum

71%

+3 −0

Show that $f(x) = \arctan\left(\frac{x}{x+1}\right) + \arctan\left(\frac{x+1}{x}\right) = \frac{\pi}{2}$

2 answers · posted 2y ago by Carefree Explorer‭ · last activity 2y ago by Derek Elkins‭

limits trigonometry

71%

+3 −0

Do the Faber partition polynomials have integer coefficients?

1 answer · posted 2y ago by Peter Taylor‭ · last activity 2y ago by Peter Taylor‭

combinatorics generating-functions polynomials

60%

+1 −0

Are vectrices useful for calculations as opposed to formalism?

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

Vectrix Numerical

75%

+4 −0

Optimising a 3 value problem (well 2 really)

1 answer · posted 2y ago by KalleMP‭ · last activity 2y ago by Peter Taylor‭

analysis formula algorithm

71%

+3 −0

Is Pythagorean theorem really valid in higher dimensional space?

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

pythagoras right-triangle

33%

+0 −2

Why's Pr(the running total of a fair dice rolled repeatedly = n) = $\frac16 (p_{n-1} + p_{n-2} + p_{n-3} + p_{n-4} + p_{n-5} + p_{n-6})$?

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

probability

77%

+5 −0

Is $f(x)=\sin(x)$ the unique function satisfying $f'(0)=1$ and $f^{(n)}(\Bbb R)\subset [-1,1]$ for all $n=0,1,\ldots$?

1 answer · posted 1y ago by Grove‭ · edited 1y ago by Pavel Kocourek‭

derivatives real-analysis

28%

+0 −3

Expanding the Integration problem.

1 answer · posted 1y ago by Anonymous‭ · last activity 1y ago by TextKit‭

integration

60%

+1 −0

How's it possible to arrange 0 objects? How can 0! = 1?

3 answers · posted 2y ago by DNB‭ · edited 2y ago by Quintec‭

combinatorics

77%

+5 −0

Notation for one-sided hypothesis testing

1 answer · posted 2y ago by tommi‭ · last activity 9mo ago by Glen_b‭

statistics notation hypothesis-testing

75%

+4 −0

What is the probability that the convex hull of $n$ randomly distributed points has $l$ of the points on its boundary?

1 answer · posted 1y ago by siric‭ · edited 1y ago by tommi‭

probability convex-hull

33%

+0 −2

Inhomogenous differential equations in sciences

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

calculus equation differential applied-mathematics

50%

+1 −1

Intuitively, why does A, B independent $\iff$ A, $B^C$ independent $\iff A^C, B^C$ independent?

1 answer · posted 3y ago by DNB‭ · last activity 3y ago by JRN‭

probability

80%

+6 −0

$g(x)\xrightarrow{x\to\infty}\infty$ Implies $g'(x)\leq g^{1+\varepsilon}(x)$

3 answers · posted 2y ago by Udi Fogiel‭ · last activity 2y ago by Peter Taylor‭

calculus

75%

+4 −0

If $\mathbf{R}$ is thought of as a vector space over $\mathbf{Q}$, what is its dimension?

1 answer · posted 1y ago by Snoopy‭ · last activity 1y ago by r~~‭

linear-algebra vector-space

71%

+3 −0

The gcd of powers in a gcd domain

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

abstract-algebra

81%

+7 −0

Does this construction always give a topological vector space?

0 answers · posted 2y ago by celtschk‭ · edited 2y ago by r~~‭

topology linear-algebra topological-vector-spaces

60%

+1 −0

$\{f_n\}\to f$ in $X$ implies $||f||\le\liminf||f_n||$

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

real-analysis functionals normed-vector-space

28%

+0 −3

How do these 3 bell curves of Likelihood, Posterior, Prior pictorialize the Odds form of Bayes' rule?

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

probability

75%

+4 −0

Missing a solution: Are A and B always equal if A-B=0

3 answers · posted 2y ago by re89j‭ · last activity 2y ago by tommi‭

logic equation algebra problem

37%

+1 −3

What's wrong with evaluating $n(n-1) \dots (n-[k-3])(n-[k-2])\color{red}{(n-[k-1])}$ at $k = 1$?

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

notation

80%

+6 −0

Does there exist a non-zero game such that the sum of three or more copies of it is zero?

0 answers · posted 1y ago by celtschk‭

combinatorial-game-theory

Communities