Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It only takes a minute to sign up.

Sign up to join this community
Anybody can ask a question
Anybody can answer
The best answers are voted up and rise to the top
Mathematics

Explore our questions

Ask Question
more tags
Interesting 49 Bountied Hot Week Month
0 votes
1 answer
31 views

Find the number of numbers with 5 digits that don't have the sequence 17 within them

Piquito's user avatar
Piquito
  • 28.3k
0 votes
1 answer
55 views

Does an infinitesimal above an number e.g., N.0(w/ 0s repeating)1 equal the number below? Similar to 0.9... equal 1

Stef's user avatar
Stef
  • 805
0 votes
0 answers
11 views

Why $y$ is a rational integer?

Emptymind's user avatar
Emptymind
  • 1,767
2 votes
2 answers
97 views

Evaluating $ \int_0^1 \frac{x^a - 1}{\ln{}x} dx$

Stefan Lafon's user avatar
Stefan Lafon
  • 11.5k
-1 votes
1 answer
38 views

How to find a closed-form expression for the sequence $x_n = x_{n-1}(1.1) + 100$

Cye Waldman's user avatar
Cye Waldman
  • 6,791
1 vote
1 answer
19 views

p x q business product sales for multiple divisions/geographies

John Hughes's user avatar
John Hughes
  • 91.4k
3 votes
0 answers
77 views

Mistake in faulty proof that Brownian Motion is non-negative almost surely.

oswinso's user avatar
oswinso
  • 186
0 votes
0 answers
12 views

Binomial Summation that Yields Factorial

HG C's user avatar
HG C
  • 1
0 votes
1 answer
18 views

Show that $f(\rho)=0$ for any modular form of weight $k$ if $\rho=e^{\frac{2\pi i}{3}}$ and $3\nmid k$.

TravorLZH's user avatar
TravorLZH
  • 5,901
1 vote
1 answer
19 views

Connection between Leibniz formula and geometric interpretation of determinants

Qiaochu Yuan's user avatar
Qiaochu Yuan
  • 409k
0 votes
0 answers
70 views
+100

How to show the quadratic integer ring O is not a UFD.

Emptymind's user avatar
Emptymind
  • 1,767
13 votes
2 answers
418 views

Translation of John Nash's 1962 Navier-Stokes paper

Teagan Lilleberg's user avatar
Teagan Lilleberg
  • 1
4 votes
2 answers
48 views

Are all nilpotent matrices strictly upper triangularizable (over the complex and real fields)?

Qiaochu Yuan's user avatar
Qiaochu Yuan
  • 409k
0 votes
1 answer
79 views

Differential equation notation

gdcvdqpl's user avatar
gdcvdqpl
  • 366
1 vote
3 answers
969 views

Partial Fraction with Unknown Constants

Community's user avatar
CommunityBot
  • 1
1 vote
0 answers
53 views

How to integrate $\iint_{-\pi/2}^{\pi/2}\sin(x+y)dxdy$

Átila Correia's user avatar
Átila Correia
  • 14.4k
0 votes
0 answers
3 views

relative commutant of the cross product of a von Neumann algebra

mathbeginner's user avatar
mathbeginner
  • 1,735
3 votes
2 answers
46 views

Find $\lim\limits_{x \to \infty} \int_{0}^1 \dfrac{xt^x}{1+t^x}dt$

Ace's user avatar
Ace
  • 11
0 votes
0 answers
7 views

A way to order trees produced by TREE(3) and find the last tree (or at least count nodes in that tree)

alamar's user avatar
alamar
  • 101
0 votes
1 answer
52 views

What is the meaning of the letter L in the L1-norm and l2-norm metric?

Qiaochu Yuan's user avatar
Qiaochu Yuan
  • 409k
3 votes
3 answers
142 views

How to prove that the axis of an ellipse are perpendicular

TurlocTheRed's user avatar
TurlocTheRed
  • 4,404
1 vote
1 answer
39 views

Misunderstanding of Fourier series and differential equation

messenger's user avatar
messenger
  • 871
1 vote
2 answers
48 views

Decomposition of compact subset of a manifold

M W's user avatar
M W
  • 3,757
0 votes
0 answers
5 views

Can a SDE hit a point where its covariance is not PD?

Nap D. Lover's user avatar
Nap D. Lover
  • 1,247
-2 votes
0 answers
55 views

How were the $x$ and $y$ coordinates of intersecting point calculated?

lightningjay's user avatar
lightningjay
  • 330
1 vote
0 answers
21 views

Prove with induction if $A= \begin{pmatrix}2&1\\-1&0 \end{pmatrix}$ $\forall n \in \mathbb{N}$ $A^n= \begin{pmatrix} n+1&n\\-n&1-n \end{pmatrix}$

wengen's user avatar
wengen
  • 369
0 votes
0 answers
14 views

How to calculate angles in a parallelogram?

Sofi Garde's user avatar
Sofi Garde
  • 47
0 votes
0 answers
16 views

Unsure about how to get intervals for roots for intermediate value theorem

Future Math person's user avatar
Future Math person
  • 2,687
1 vote
1 answer
30 views

GM and AM convex cone

NN2's user avatar
NN2
  • 11.1k
4 votes
3 answers
106 views

If $a_1,\ldots, a_n$ are numbers such that $a_1^k+\cdots + a_n^k = x$ for $1\leq k\leq n$, determine the product $a_1\cdots a_n$ in terms of $x$.

K B Dave's user avatar
K B Dave
  • 7,538
0 votes
0 answers
15 views

Estimate the error if $P_2 = 1-\frac{x^2}{2}$ is used to to estimate the value of $\cos(x)$ with $x<0.1$

cjferes's user avatar
cjferes
  • 1,925
0 votes
0 answers
21 views

How to solve following LPP using graphical method.

Math1000's user avatar
Math1000
  • 36.1k
1 vote
1 answer
11 views

Proving that $\text{rank}(\phi \circ \psi) \geq \text{rank}(\phi) + \text{rank}(\psi) - n$

Carlyle's user avatar
Carlyle
  • 1,226
5 votes
0 answers
142 views
+50

Can $!1+!2+!3+\cdots+!n$ be a perfect power?

Thirdy Yabata's user avatar
Thirdy Yabata
  • 55
6 votes
0 answers
117 views
+50

Is $10^n+n^{10}$ prime for some integer $n \ge 2$?

Thirdy Yabata's user avatar
Thirdy Yabata
  • 55
2 votes
1 answer
47 views

Inclusion functor is final?

Qiaochu Yuan's user avatar
Qiaochu Yuan
  • 409k
0 votes
1 answer
33 views

If $X$ is a simply-connected $n$-dimensional CW complex, then any $f : X \rightarrow \mathbb RP^{n+1}$ is homotopic to a constant map

Paul Frost's user avatar
Paul Frost
  • 71.5k
1 vote
1 answer
22 views

Negation of a statement validation

RyRy the Fly Guy's user avatar
RyRy the Fly Guy
  • 4,662
1 vote
0 answers
21 views

Minimum of ratio of cosine functions

Greg Martin's user avatar
Greg Martin
  • 73.6k
0 votes
0 answers
25 views

Equivalence relationship defined over membership of a in halo of b. (Non-Standard Analysis, Monads, Halos)

Roman Schiffino's user avatar
Roman Schiffino
  • 11
5 votes
1 answer
426 views

Prove that the expression is identically zero.

epi163sqrt's user avatar
epi163sqrt
  • 105k
1 vote
1 answer
24 views

Confusuion with trivial solution to a system of equations

Sammy Black's user avatar
Sammy Black
  • 22.2k
0 votes
0 answers
16 views

Matching probelm in a recursive way

alice123019's user avatar
alice123019
  • 123
-1 votes
0 answers
19 views

Help me find the closed form formula for this a(n) = 4*a(n-3) - a(n-6) the values are 1,3,11,41,153... for values of n that are 0,3,6,9,12...

Cool Kid's user avatar
Cool Kid
  • 1
1 vote
1 answer
45 views

What difference does it make if many differential equations can't be solved analytically?

Alp Uzman's user avatar
Alp Uzman
  • 9,969
2 votes
0 answers
50 views

Proving an integral inequality involving Lipschitz functions

copper.hat's user avatar
copper.hat
  • 169k
0 votes
0 answers
3 views

Tomita algebra associated to nsf weight on von Neumann algebra

Andromeda's user avatar
Andromeda
  • 356
0 votes
0 answers
19 views

Does correlation of inverse covariance matrix implies conditional independence?

acuarius trend's user avatar
acuarius trend
  • 1
0 votes
0 answers
13 views

Sensitivity to noise in nonlinear parameter estimation

Andy's user avatar
Andy
  • 759
0 votes
1 answer
219 views

$(k,l)$ shuffle and wedge product

krm2233's user avatar
krm2233
  • 2,381
0 votes
1 answer
29 views

MLE Estimation - Non-Differentiable Log Likelihood Function

heropup's user avatar
heropup
  • 125k
1 vote
2 answers
2k views

Complement in $\Bbb C$ of a compact subset of $\Bbb R$ is connected.

Cameron Buie's user avatar
Cameron Buie
  • 102k
-1 votes
0 answers
12 views

Question on isolating ${a}$ in the given equation: ${ac\:=\:v^a\left(v^{a-2}-1\right)}$

AmB's user avatar
AmB
  • 25
3 votes
1 answer
85 views

Proof of statement with modular arithmetics

John Omielan's user avatar
John Omielan
  • 45.8k
1 vote
0 answers
51 views

Does the following Integral have a solution in elementary functions?

Mihindu's user avatar
Mihindu
  • 11
0 votes
1 answer
59 views

Limit of $\lim _{x\to \infty }\left(\frac{2^{\frac{1}{10}\left(log_2x\right)^{\frac{1}{2}}}}{log_2x}\right)$

sreysus's user avatar
sreysus
  • 582
11 votes
1 answer
763 views
+500

What is the connection between algebraic groups and topoi?

Lukas Heger's user avatar
Lukas Heger
  • 18.4k
3 votes
2 answers
71 views

Given $H \leq G$, prove a group $C(x) \leq G$ and $N_G(H) \leq G$

anonymous's user avatar
anonymous
  • 3,204
0 votes
0 answers
23 views

What is the projected area of a solid onto an axis of rotation?

rgov's user avatar
rgov
  • 103
1 vote
1 answer
46 views

Etale Stalks of the Hom sheaf

Aphelli's user avatar
Aphelli
  • 33k
0 votes
0 answers
18 views

Involution on $l^1(G)$

Anna Vakarova's user avatar
Anna Vakarova
  • 87
1 vote
0 answers
21 views

Strong convergence of compact operator

liamsi Meean's user avatar
liamsi Meean
  • 41
0 votes
0 answers
45 views

$\int_0^\infty \frac{\ln x}{(1+e^{x})^2}dx$ by contour integration

Hans's user avatar
Hans
  • 9,583
0 votes
0 answers
15 views

General solution for the $n$-dimensional wave equation using inverse Fourier transform

A. Riba's user avatar
A. Riba
  • 83
0 votes
0 answers
31 views

Question on the Length of Modules

pleasantpheasant's user avatar
pleasantpheasant
  • 71
-1 votes
0 answers
9 views

Prove that the sum of the probabilities of all state paths of same length is equal to 1.

Thanh Le's user avatar
Thanh Le
  • 1
4 votes
1 answer
76 views

Compact set $K_\epsilon\subset B$ such that $\ell^*(B\setminus K_\epsilon) \leq \epsilon$

Kadmos's user avatar
Kadmos
  • 1,005
1 vote
0 answers
21 views

LU decomposition of banded matrix with partial pivoting

Wout's user avatar
Wout
  • 113
0 votes
0 answers
8 views

Existence of a sequence of deterministic measurable kernels (Skorohod Integral and Chaos Expansion)

herrmath's user avatar
herrmath
  • 1
0 votes
0 answers
21 views

Concatenating consecutive numbers to find primes? (General number theory question)

Bill Dubuque's user avatar
Bill Dubuque
  • 267k
3 votes
1 answer
58 views

Does the sequence $x_n := n^2/\sqrt{n^6+1} + n^2/\sqrt{n^6+2} + . . . + n^2/\sqrt{n^6+n}$ converge? If it does, what value does it converge to?

User8128's user avatar
User8128
  • 15.2k
0 votes
0 answers
14 views

Confusion about the definition of a nonlinear recurrence relation and recurrence relation with fractional subscript.

Askorin's user avatar
Askorin
  • 1
0 votes
0 answers
27 views

Proportion of time a sum of Gaussians is above 0

GTauchen's user avatar
GTauchen
  • 26
0 votes
0 answers
27 views

How to find out a particular set of permutations cannot generate the whole symmetric group $S_n$

Vincent J. Ruan's user avatar
Vincent J. Ruan
  • 763
0 votes
0 answers
19 views

Explicit 2-cocycle on a Hopf algebra

AmSa's user avatar
AmSa
  • 111
1 vote
1 answer
8 views

Equation of a sequence of a pyramid of glasses. Trying to find the sequence equations for the fill rates and number of pours.

Prem's user avatar
Prem
  • 6,275
1 vote
0 answers
17 views

Derivative of a Matrix equation

Rio's user avatar
Rio
  • 11
0 votes
0 answers
39 views

Definite Integral $\int \tanh(a\cdot \operatorname{atanh}(x)+b)\,\mathrm dx$

Aaron Hendrickson's user avatar
Aaron Hendrickson
  • 5,871
1 vote
0 answers
30 views

Find some subgroups of the symmetric group $S_n$ having more than $k$ generators

Vincent J. Ruan's user avatar
Vincent J. Ruan
  • 763
1 vote
0 answers
14 views

How to integrate function gradients over plane?

Matheus C's user avatar
Matheus C
  • 11
4 votes
1 answer
155 views

Intersection of nested compact sets

Rob Arthan's user avatar
Rob Arthan
  • 45.3k
0 votes
0 answers
17 views

EA and BA are abelian groups?

Kind Bubble's user avatar
Kind Bubble
  • 53
1 vote
0 answers
13 views

Reference for the bordered Hessian method

Victor Ronchim's user avatar
Victor Ronchim
  • 1,103
2 votes
1 answer
43 views

Identify $d$ heavy coins where $d$ is unknown.

Mike Earnest's user avatar
Mike Earnest
  • 70.6k
1 vote
0 answers
30 views

Terminology for "transposition" of monomorphism to epimorphism in simplex category?

Brendan Murphy's user avatar
Brendan Murphy
  • 571
3 votes
0 answers
53 views

How to proof the derivative is continuous

Anton Vrdoljak's user avatar
Anton Vrdoljak
  • 2,281
1 vote
0 answers
16 views

Conditions that lead empirical set of covariance matrices to follow optimal transport path?

dherrera's user avatar
dherrera
  • 148
1 vote
0 answers
17 views

Van der Waerden's theorem through Ramsey's Theorem

Alma Arjuna's user avatar
Alma Arjuna
  • 1,763
0 votes
0 answers
16 views

Resources for Abelian surfaces

Jacob Lewis's user avatar
Jacob Lewis
  • 101
1 vote
0 answers
13 views

Proving Dirichlet character is primitive

L-JS's user avatar
L-JS
  • 655
0 votes
1 answer
56 views

$\frac{2}{x_1+1} + \frac{2}{x_2+1} + \frac{2}{x_3+1} + ... + \frac{2}{x_n+1} \leq n$

Macavity's user avatar
Macavity
  • 45.2k
4 votes
1 answer
2k views

Distinguishing $SU(n)$ from $SO(n)$

Moishe Kohan's user avatar
Moishe Kohan
  • 92.4k
1 vote
0 answers
11 views

How to find outage probability in wireless communication

noor's user avatar
noor
  • 11
1 vote
1 answer
21 views

Expectation of removing subtree

Charlie's user avatar
Charlie
  • 115
1 vote
0 answers
10 views

Almost internal point which is not internal

doubledual's user avatar
doubledual
  • 41
0 votes
0 answers
20 views

Prove there is homography between a line and algebraic set

John's user avatar
John
  • 321
Browse more Questions

Your privacy

By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.