Mathematics

75%

+4 −0

Generalization of categorical product

1 answer · posted 1y ago by r~~‭ · last activity 1y ago by Derek Elkins‭

category-theory

75%

+4 −0

Is this formula for the minimal sum correct?

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

set-theory ordinal-numbers

71%

+3 −0

Matrices with rotational symmetry

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

linear-algebra matrices

71%

+3 −0

"Pointwise equicontinuity implies uniform" implies compact

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

real-analysis equicontinuity continuity metric-spaces

71%

+3 −0

Maximize Independent Variable of Matrix Multiplication

1 answer · posted 2y ago by Josh Hyatt‭ · edited 2y ago by Josh Hyatt‭

matrices vector

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

71%

+3 −0

Notation for nested exponents

1 answer · posted 2y ago by JRN‭ · last activity 2y ago by leovt‭

notation exponents

71%

+3 −0

Are we in a "history-valley" for Topology?

2 answers · posted 2y ago by whybecause‭ · last activity 2y ago by Derek Elkins‭

topology history-philosophy-of-math

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

71%

+3 −0

The gcd of powers in a gcd domain

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

abstract-algebra

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 1y ago by Carefree Explorer‭ · last activity 1y ago by Derek Elkins‭

limits trigonometry

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

71%

+3 −0

Given two angles of a triangle, finding an angle formed by a median

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

euclidean-geometry vector

71%

+3 −0

organizing a library

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

combinatorics recreational-mathematics

71%

+3 −0

Show that $\forall n \in \mathbb{Z}^{+}$, $25^n \equiv 25 \bmod{100}$.

2 answers · posted 1y ago by Carefree Explorer‭ · edited 1y ago by Peter Taylor‭

number-theory recreational-mathematics modular-arithmetic

71%

+3 −0

Criterion in terms of the bases for determining whether one topology is finer than another

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

topology

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

71%

+3 −0

Finding the limit $ \lim_{x\to 0^+}e^{1/x}\sum_{n=\lfloor 1/x\rfloor}^\infty\frac{x^n}{n} $

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

real-analysis limits

71%

+3 −0

Do linear and group invariant functions allowed to go inside(?) integral operators?

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

integration geometric-deep-learning invariant-function

71%

+3 −0

Classification for involutory real infinite series

1 answer · posted 9mo ago by nsajko‭ · last activity 8mo ago by Peter Taylor‭

classification real-analysis inverse polynomials series

71%

+3 −0

Is there a quadratic version of exponential smoothing?

0 answers · posted 8mo ago by peterbalch‭

statistics signal-processing

71%

+3 −0

Properties of distances between adjacent vector elements and related functions

1 answer · posted 10mo ago by stofred‭ · last activity 10mo ago by Artisian‭

analysis vector recreational-mathematics integer-sequences

71%

+3 −0

Average distance from circle's center to a point

1 answer · posted 10mo ago by TheCodidacter, or rather ACodidacter‭ · last activity 10mo ago by TheCodidacter, or rather ACodidacter‭

geometry calculus

71%

+3 −0

how to mathematically express a relationship in which a vector can be any 3D unit vector

2 answers · posted 11mo ago by Trevor‭ · last activity 10mo ago by trichoplax‭

notation vector

71%

+3 −0

Closed-form expression for sum of Modulo Arithmetic Progression

1 answer · posted 11mo ago by theabbie‭ · edited 11mo ago by trichoplax‭

formula summation sequence modular-arithmetic

71%

+3 −0

Besov or Triebel-Lizorkin spaces versus Lorentz spaces

0 answers · posted 1mo ago by LL 3.14‭ · edited 1mo ago by LL 3.14‭

interpolation Besov-space functional-analysis

71%

+3 −0

Is it possible to show that a normalised random variable has zero mean and unit variance?

0 answers · posted 7mo ago by mr Tsjolder‭ · edited 7mo ago by mr Tsjolder‭

statistics expectation

71%

+3 −0

What is an example of a pathological imbedding of a(n allowed) graph into an oriented surface?

0 answers · posted 1mo ago by The Amplitwist‭ · edited 1mo ago by The Amplitwist‭

topology graph-theory

71%

+3 −0

If both $\lim_{x\to\infty}f(x)$ and $\lim_{x\to\infty}f'(x)$ exist, then $\lim_{x\to\infty}f'(x)=0$.

1 answer · posted 3mo ago by Snoopy‭ · last activity 3mo ago by Snoopy‭

real-analysis

71%

+3 −0

Is there a $\Delta$-complex structure on the sphere with less than three $0$-simplices?

1 answer · posted 5d ago by The Amplitwist‭ · last activity 17h ago by Derek Elkins‭

algebraic-topology delta-complex

71%

+3 −0

Is there a $(n_3)$ configuration which is not self-dual?

1 answer · posted 4mo ago by WheatWizard‭ · last activity 4mo ago by Peter Taylor‭

combinatorics

71%

+3 −0

What does the distribution of a strictly increasing random walk look like if you stop at `N` steps?

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

combinatorics

71%

+3 −0

What is a dummy variable (in an integral)?

1 answer · posted 2y ago by deleted user · edited 2y ago by JRN‭

calculus integration gamma-function beta-function

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

71%

+3 −0

What're the orders for equation expressing?

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

exponent equation order grouping arithmetic

71%

+3 −0

Why would skyrocketing the numbers of doors help laypeople intuit the Monty Hall Problem?

1 answer · posted 2y ago by DNB‭ · edited 2y ago by DNB‭

probability

71%

+3 −0

Find limits of integration in polar coordinates

2 answers · posted 2y ago by MissMulan‭ · last activity 2y ago by r~~‭

calculus double-integrals polar

71%

+3 −0

Asymptotics of counting integers by prime signature

1 answer · posted 3y ago by Peter Taylor‭ · last activity 3y ago by Derek Elkins‭

number-theory

71%

+3 −0

Method to calculate the area of a cyclic n-gon

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

geometry polygon area

71%

+3 −0

Why does this definition of generalized forces work?

1 answer · posted 3y ago by Technically Natural‭ · last activity 3y ago by Derek Elkins‭

differential-geometry lagrangian-mechanics classical-mechanics physics

71%

+3 −0

Including Association Analysis results into existing Classification Model

0 answers · posted 3y ago by Guilherme Costa‭

classification association-rules

71%

+3 −0

Isn't it wrong to write that Indefinite Integral = Definite Integral with a variable in its Upper Limit?

2 answers · posted 3y ago by TextKit‭ · edited 3y ago by The Amplitwist‭

calculus

71%

+3 −0

Cutting the square

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

geometry

70%

+5 −1

What is the formula for sample standard deviation of a small sample size?

2 answers · posted 7mo ago by Ivan Nepomnyashchikh‭ · last activity 7mo ago by Agent Smith‭

statistics

70%

+5 −1

equilateral triangle inscribed in an ellipse

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

conics triangle

66%

+2 −0

Example of $f:[0,1]\to\mathbf{R}$ with $\lim_{a\to 0^+}\int_a^1f(x)dx=L $ for some real number $L$ but $\int_0^1|f(x)|dx=\infty $

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

real-analysis improper-integral

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

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

Unification and generalization of limit and colimit

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

limits category-theory

66%

+2 −0

$\sup(A\cdot B) = (\sup A)(\sup B)$ where $A$ and $B$ bounded sets of positive real numbers

3 answers · posted 3mo ago by Snoopy‭ · edited 3mo ago by Snoopy‭

real-analysis supremum-infimum

Communities