Skip to main content
Mathematics

Explore our questions

Ask Question
more tags
Interesting 13 Bountied Hot Week Month
5 votes
2 answers
1k views

Limits and Series in Smooth Infinitesimal Analysis

Vadique Myself's user avatar
Vadique Myself
  • 304
3 votes
3 answers
171 views

Value of $\prod_{p} \frac{p+1}{p}$?

Oscar Lanzi's user avatar
Oscar Lanzi
  • 52.4k
4 votes
5 answers
256 views

Length of ellipse on a cylindrical surface

Ethan Bolker's user avatar
Ethan Bolker
  • 107k
1 vote
1 answer
5k views

Solution Manual for Graph Theory with Applications (Bondy and Murty)

Community's user avatar
CommunityBot
  • 1
4 votes
1 answer
113 views

distribution of bisecting great circles

Anton Sherwood's user avatar
Anton Sherwood
  • 648
0 votes
0 answers
21 views

Prime frequency plots based on the first term of the bi-linear expansion of log(n) as a bounded log

fbatrouni's user avatar
fbatrouni
  • 350
9 votes
3 answers
289 views

Find the maximum of $x_1+...+ x_9$ given $x_1, \cdots, x_9 \in [-1, 1]$ with $x_1^3 + \cdots + x_9^3 = 0$

River Li's user avatar
River Li
  • 52.1k
5 votes
3 answers
417 views

Alterations of Digits in Integers (Q. 18)

Neil's user avatar
Neil
  • 223
4 votes
2 answers
342 views

Evaluate the integral $\int_0^{\frac{\pi}{2}}\ln\left(2\sin\left(\frac{x}{2}\right)\right) \ln\left(\cot x\cot \left(\frac{x}{2}\right)\right)dx$

Quanto's user avatar
Quanto
  • 126k
3 votes
1 answer
144 views

Constructing diffeomorphisms of moduli spaces of $J$-holomorphic curves

Michael Albanese's user avatar
Michael Albanese
  • 105k
0 votes
1 answer
87 views

Linear recurrence for the digits of $a_{mn}$ in base $a_n$

Ivan Nikitin's user avatar
Ivan Nikitin
  • 59
3 votes
1 answer
715 views

Cartesian product of two $G_\delta$ sets is measurable

Community's user avatar
CommunityBot
  • 1
1 vote
2 answers
166 views

Line integral $F(x,y,z) = \left( 2xyz + \sin(x)\right)\mathbf i + x^2z \mathbf j +x^2 y \mathbf k $

Anne Bauval's user avatar
Anne Bauval
  • 51.5k
46 votes
1 answer
12k views

Proving that the pullback map commutes with the exterior derivative

hbghlyj's user avatar
hbghlyj
  • 6,891
0 votes
2 answers
108 views

Is it possible to prove FLT for $n=3$ through proving $z/(x+y)$ to be irrational?

Bill Dubuque's user avatar
Bill Dubuque
  • 286k
1 vote
2 answers
715 views

Given matrix $A$ and column vector $x$, what is the derivative of $Ax$ with respect to $x$?

Community's user avatar
CommunityBot
  • 1
2 votes
1 answer
47 views

Given an epimorphism of commutative rings $\varphi:A\to B$, what topological properties does $\operatorname{Spec}\varphi$ have?

Elia Immanuel Auer's user avatar
Elia Immanuel Auer
  • 5,200
0 votes
1 answer
750 views

Showing that there are unique real $a$ and $b$ satisfying $3\sin a-2\cos b=6a-12$ and $\cos a + 3\sin b=6b+6$

Blue's user avatar
Blue
  • 86k
1 vote
3 answers
525 views

How to identify mathematical model of "Fuel Problem"?

CodingDany's user avatar
CodingDany
  • 1
0 votes
0 answers
355 views

How to solve advection-diffusion equation by using transformation.

Gonçalo's user avatar
Gonçalo
  • 17.1k
-1 votes
1 answer
71 views

How to find the convolution of the function with itself from graph

Srini's user avatar
Srini
  • 2,475
2 votes
1 answer
41 views

Unbiased estimator assumption for delta method

Eleven's user avatar
Eleven
  • 21
0 votes
0 answers
15 views

Extension of a Population Identity to the Joint Model

SATYA's user avatar
SATYA
  • 77
3 votes
4 answers
8k views

What is $\Gamma(1/4)$? I'm trying to figure out how you would go about solving it

Andrés Rodríguez Cantú's user avatar
Andrés Rodríguez Cantú
  • 1
9 votes
1 answer
410 views

A zombie apocalypse

Rodrigo de Azevedo's user avatar
Rodrigo de Azevedo
  • 23.8k
0 votes
0 answers
18 views

Second fundamental form and geodesic curvatures of frame lines

DanielKatzner's user avatar
DanielKatzner
  • 177
8 votes
1 answer
123 views

$TT^*$ norm is equal to $\|T\|^2$ if $T:\mathcal{H}\to \mathcal{B}$ where $\mathcal{H}$ is Hilbert and $\mathcal{B}$ is Banach

Nathanael Skrepek's user avatar
Nathanael Skrepek
  • 2,663
0 votes
1 answer
29 views

Corank of Jacobian is preserved under base change (Vakil 13.1.L)

KReiser's user avatar
KReiser
  • 76.8k
4 votes
1 answer
162 views

Solve $\log_5{(x)} \cdot \log_4{(27-x)}=1$

Steven Stadnicki's user avatar
Steven Stadnicki
  • 53.5k
0 votes
1 answer
724 views

The complexified Lie algebra $\mathfrak{so}(p,q)_\mathbb{C}$ is isomorphic to $\mathfrak{so}(p+q,\mathbb{C})$

Community's user avatar
CommunityBot
  • 1
-1 votes
1 answer
51 views

Alterations of digits in integers

ilovemycat's user avatar
ilovemycat
  • 11
0 votes
0 answers
21 views

Is taking the infimum over a set of functions the same as taking the infimum over the co-domain of these functions

guest1's user avatar
guest1
  • 786
2 votes
1 answer
95 views

Equivalent definitions of unramified homomorphism

KReiser's user avatar
KReiser
  • 76.8k
16 votes
1 answer
3k views

Munkres, Chapter 2, question on locally finite family of sets

Brian M. Scott's user avatar
Brian M. Scott
  • 636k
2 votes
0 answers
143 views

A Partial Differential Equation

Gonçalo's user avatar
Gonçalo
  • 17.1k
0 votes
1 answer
58 views

Possible issue with Theorem 19.2 in Munkres regarding basis of product topology

Prem's user avatar
Prem
  • 15.9k
1 vote
1 answer
86 views

A question about mapping class group of the torus

Lee Mosher's user avatar
Lee Mosher
  • 139k
5 votes
1 answer
380 views

Relative difficulty of angle trisection and cube roots

Taras Banakh's user avatar
Taras Banakh
  • 1,123
1 vote
1 answer
86 views

Tensor product of structure sheaves

Calculus101's user avatar
Calculus101
  • 583
3 votes
1 answer
117 views

Exercise in Charlap's book

sTertooy's user avatar
sTertooy
  • 7,089
1 vote
2 answers
712 views

Is there an overcomplete equivalent of generating a random orthonormal basis set?

Community's user avatar
CommunityBot
  • 1
1 vote
1 answer
191 views

Is there a general form of magic squares?

Aleksandr 's user avatar
Aleksandr
  • 59
5 votes
0 answers
150 views

Finding the minimum value of $\sum_{k=1}^{2n+1} \left \lvert \cos \left(kx \right) \right \rvert$

Anne Bauval's user avatar
Anne Bauval
  • 51.5k
10 votes
1 answer
279 views

homology classes and maps to projective spaces

Derived Cats's user avatar
Derived Cats
  • 4,281
2 votes
3 answers
123 views

matrix multiplication over $\mathbb C$

yadin's user avatar
yadin
  • 49
2 votes
1 answer
952 views

Difference between F-space and Frechet space in W. Rudin's "Functional Analysis"

KCd's user avatar
KCd
  • 57.6k
23 votes
4 answers
3k views

A person who lies a fourth of the time throws a die and says it is a six. What is the probability it is actually a six?

Greg Martin's user avatar
Greg Martin
  • 94.8k
-1 votes
1 answer
68 views

Set-theoretic mathematical structure for Combinations ($^nC_{k_1} \times ^mC_{k_2}$) where $m$, $n$ are disjoint

Noah Schweber's user avatar
Noah Schweber
  • 266k
0 votes
1 answer
712 views

partial derivative of conditional expectation

Community's user avatar
CommunityBot
  • 1
5 votes
1 answer
178 views

Number of representations of an integer by a binary quadratic form

Olivier Ramaré's user avatar
Olivier Ramaré
  • 101
4 votes
0 answers
50 views

Linear Dependence and Independence -- definition on a general module?

Ben Grossmann's user avatar
Ben Grossmann
  • 236k
0 votes
1 answer
44 views

Question regarding the proof of theorem 3-12 from Calculus on manifolds by Spivak

Aniruda Suswaram's user avatar
Aniruda Suswaram
  • 489
0 votes
0 answers
15 views

Bounds on the Expectation of a Supremum over all Markov Kernels

Joseph Expo's user avatar
Joseph Expo
  • 678
1 vote
1 answer
103 views

Radius of convergence of power series is equal to one.

Anne Bauval's user avatar
Anne Bauval
  • 51.5k
0 votes
1 answer
1k views

Definition of matrix transformation

Community's user avatar
CommunityBot
  • 1
-1 votes
3 answers
725 views

Resultant Velocity

true blue anil's user avatar
true blue anil
  • 50.1k
1 vote
1 answer
41 views

Normal subgroup of a finite index subgroup has a finite index subgroup normal in ambient group?

diracdeltafunk's user avatar
diracdeltafunk
  • 17.2k
6 votes
1 answer
135 views

double sum $\sum _{m=1}^{\infty}\sum_{\substack{n=1 \\ n \neq m}}^{\infty}\frac{1-\left(-1\right)^{n+m}}{n^2-m^2}$

Svyatoslav's user avatar
Svyatoslav
  • 21.7k
24 votes
5 answers
2k views

Clarifying the homomorphism's definition?

José Carlos Santos's user avatar
José Carlos Santos
  • 443k
0 votes
1 answer
782 views

Why a monoidal category with only one object is a monoid in the category of monoids?

Vladimir Sotirov's user avatar
Vladimir Sotirov
  • 16.2k
6 votes
3 answers
2k views

Definition of tautological section.

hm2020's user avatar
hm2020
  • 10.5k
1 vote
2 answers
686 views

Does every (non-separable) Hilbert space have the approximation property?

Jakobian's user avatar
Jakobian
  • 16.7k
1 vote
1 answer
65 views

The explicit description of exceptional sets in Gathmann's definition of blowing up

Derek Allums's user avatar
Derek Allums
  • 3,197
0 votes
2 answers
36 views

# Concyclicity and Power of a Point in a Circle

jjagmath's user avatar
jjagmath
  • 24.8k
5 votes
1 answer
168 views

Is this a version of Aubin Lions Lemma?

Calvin Khor's user avatar
Calvin Khor
  • 36.7k
0 votes
0 answers
16 views

Electrical flow for approximating graph metrics

FidelCastro's user avatar
FidelCastro
  • 153
0 votes
1 answer
54 views
+50

How to systematically find an unbounded direction in the simplex method? (Optimization Course)

mathlove's user avatar
mathlove
  • 156k
4 votes
0 answers
52 views

Is it possible to find the surface area of this part of a channel surface?

Lawton's user avatar
Lawton
  • 2,295
0 votes
1 answer
56 views

Computing minors and rank of Jacobian matrix to show algebraic independence

A.B's user avatar
A.B
  • 503
1 vote
1 answer
47 views

Burnikel-Ziegler division for base $10^k$

fosterchild's user avatar
fosterchild
  • 31
0 votes
1 answer
51 views

Minimum modulus of a polynomial

José Carlos Santos's user avatar
José Carlos Santos
  • 443k
0 votes
2 answers
57 views

Gaussian integral with complex linear term from 0 to infinity

Oscar Lanzi's user avatar
Oscar Lanzi
  • 52.4k
1 vote
1 answer
43 views

A doubt of separably generated implies separable

Hagen Knaf's user avatar
Hagen Knaf
  • 9,552
1 vote
0 answers
24 views

Bias on smooth approximation conditional value at risk

Rodrigo de Azevedo's user avatar
Rodrigo de Azevedo
  • 23.8k
0 votes
1 answer
50 views

Incomplete Gammafunction

R. J. Mathar's user avatar
R. J. Mathar
  • 4,991
1 vote
1 answer
72 views

$W^{\infty,p}(\Omega)=C^\infty(\Omega)$ for non-Lipschitz bounded domains $\Omega$?

K.defaoite's user avatar
K.defaoite
  • 14.4k
0 votes
1 answer
142 views

Finding an optimal trajectory

Gonçalo's user avatar
Gonçalo
  • 17.1k
4 votes
0 answers
44 views

Are there closed-form solutions to ODEs differential equations of the form $y''+ay'+by+cy|y|=0$? (non-linear damped pendulum approximation)

Joako's user avatar
Joako
  • 2,277
0 votes
1 answer
58 views

Is there a bijection from derived sets to topologies (over the same space)?

J. W. Tanner's user avatar
J. W. Tanner
  • 64.9k
1 vote
0 answers
43 views

A question about polynomial function which $kf’(x_p)=f’(x_q)$

Bowei Tang's user avatar
Bowei Tang
  • 5,178
2 votes
1 answer
304 views

Conceptual understanding of minimalist axioms for metric space

Z. A. K.'s user avatar
Z. A. K.
  • 14k
1 vote
0 answers
23 views

Does the exterior algebra flip statistics for all superspaces?

Aether's user avatar
Aether
  • 43
0 votes
3 answers
45 views

Trouble constructing a set with specific density at a point

Sven-Ole Behrend's user avatar
Sven-Ole Behrend
  • 1,808
2 votes
0 answers
18 views

Convergence of an Ito-diffusion process to a finite state-space CTMC

Ildar's user avatar
Ildar
  • 21
0 votes
0 answers
38 views

Visually, what is the atomic norm?

Rodrigo de Azevedo's user avatar
Rodrigo de Azevedo
  • 23.8k
1 vote
0 answers
49 views

Probabilistic model for prime gaps

Michael Smith's user avatar
Michael Smith
  • 305
0 votes
0 answers
46 views

Finding values in-between a matrix

Nothing's user avatar
Nothing
  • 672
3 votes
1 answer
41 views

Recursive functions with μ-operator

redib's user avatar
redib
  • 115
2 votes
0 answers
42 views

Compact Zariski dense subgroup of rational points of semisimple algebraic group over local fields

stupid boy's user avatar
stupid boy
  • 647
2 votes
6 answers
288 views

$\frac{b^2-a^2}{c+a} + \frac{c^2-b^2}{a+b} + \frac{a^2-c^2}{b+c} \ge 0$ Proof

Átila Correia's user avatar
Átila Correia
  • 20k
2 votes
0 answers
50 views

Second gradient pointwise Green function estimates $|\nabla_x^2 G(x,y) | \le C |x-y|^{-d}$ for $L=\nabla(a(x)\nabla)$

Evangelopoulos Foivos's user avatar
Evangelopoulos Foivos
  • 4,574
1 vote
1 answer
88 views

Probability and set theory (limsup and liminf exercises)

spaceisdarkgreen's user avatar
spaceisdarkgreen
  • 70.6k
0 votes
2 answers
715 views

Show that a normed vector space is complete

KCd's user avatar
KCd
  • 57.6k
1 vote
3 answers
2k views

Countable connected subsets of $\mathbb R$

PatrickR's user avatar
PatrickR
  • 8,022
2 votes
1 answer
743 views

Number of zeros of Wronskian

Community's user avatar
CommunityBot
  • 1
2 votes
1 answer
341 views

Torsion in a manifold embedded in the 3 sphere

hbghlyj's user avatar
hbghlyj
  • 6,891
Browse more Questions