Mathematics Stack Exchange

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4

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Differentiability of power series on $\text{Hom}(\mathbb{R}^n, \mathbb{R}^n)$.

analysis multivariable-calculus derivatives vector-spaces normed-spaces

asked 3 mins ago pofu curj 1

1

vote

2

answers

17

views

How would I convert a recursive geometric sequence summation to a formula?

sequences-and-series summation geometric-series

answered 4 mins ago Sayan Dutta 3,720

0

votes

0

answers

5

views

Derivative of a (Tensor-) function

derivatives tensors

asked 5 mins ago loop_ 41

0

votes

1

answer

4k

views

Can anything equal DNE?

limits notation

modified 6 mins ago 11qq00 105

1

vote

0

answers

3

views

Complete reducibility, in linear algebra and in topology

general-topology group-theory representation-theory

asked 7 mins ago Michael_1812 1,242

0

votes

1

answer

25

views

Analytical solution of a (matrix) 1st-order different equation

ordinary-differential-equations

modified 9 mins ago Cesareo 23k

3

votes

2

answers

34

views

A paradox in probability

probability paradoxes

answered 9 mins ago Especially Lime 35.6k

0

votes

1

answer

2k

views

Prove that optimal solution is an extreme point in LPP.

optimization linear-programming

modified 10 mins ago CommunityBot 1

0

votes

0

answers

3

views

Squaring the weights of an undirected graph and minimum spanning trees

discrete-mathematics graph-theory trees planar-graphs

asked 11 mins ago Rob32409 95

1

vote

1

answer

43

views

Lemma 10.94 from Goertz' and Wedhorn's Algebraic Geometry I

algebraic-geometry schemes limits-colimits

answered 12 mins ago Jun Koizumi 166

0

votes

1

answer

51

views

Iteration of logarithm

reference-request logarithms fixed-point-theorems fractional-iteration

modified 12 mins ago Sayan Dutta 3,720

4

votes

2

answers

552

views

Prove Cauchy-Schwarz with AM-GM for three variables

linear-algebra inequality proof-writing cauchy-schwarz-inequality

answered 13 mins ago Clement C. 62.3k

0

votes

0

answers

13

views

Write an equation of a circle that passes through the point (s,3s) centered at (a,b).

calculus geometry circles

asked 14 mins ago askmaster 1

0

votes

0

answers

6

views

Implicit Trapezoidal Rule

numerical-methods

asked 14 mins ago Damini Dhiman 33

0

votes

1

answer

28

views

Can we show the Voss-Weyl formula "the other way"?

differential-geometry reference-request divergence-operator

answered 17 mins ago peek-a-boo 27.8k

1

vote

0

answers

19

views

Is $( (\lnot p \lor q ) \lor ( p \lor r ) )$ equivalent to $( \lnot p \lor q \lor p \lor r )$?

discrete-mathematics

modified 24 mins ago user10354138 28.9k

0

votes

1

answer

48

views

Prove that $x + V$ is an affine subspace of $X$, where $V\subset T$ is a subspace (Dodson & Poston)

linear-algebra geometry tensors affine-geometry

modified 26 mins ago epsilon-emperor 7,804

-2

votes

0

answers

12

views

Periodic function with period 2

functions

asked 29 mins ago Iamouthere 1

1

vote

1

answer

52

views

Solve a differential equation by finding an integrating factor

ordinary-differential-equations

modified 37 mins ago JJacquelin 59.1k

2

votes

1

answer

43

views

On odd perfect numbers and a GCD - Part IV

number-theory solution-verification gcd-and-lcm divisor-sum perfect-numbers

answered 43 mins ago mathlove 119k

0

votes

0

answers

3

views

$BAB \leq A$ when $B \leq I$, in Loewner order

linear-algebra matrices convex-cone

asked 44 mins ago permanganate 173

2

votes

0

answers

34

views

Explicit estimate of sum of primes

number-theory reference-request prime-numbers analytic-number-theory

modified 50 mins ago Archer 59

-1

votes

0

answers

6

views

Integration related to Dirac's Delta in Level-Set

calculus integration analysis dirac-delta

asked 51 mins ago JinHZ 1

-1

votes

0

answers

8

views

Does mean square convergence imply Cauchy convergence of each realization?

probability-theory probability-limit-theorems

asked 52 mins ago Shree 577

2

votes

0

answers

36

views

+100

Local isometric immersion from $\mathbb H^{n}$ into $\mathbb R^{2n-1}$

differential-geometry riemannian-geometry surfaces curvature isometry

modified 52 mins ago Zaragosa 109

0

votes

1

answer

16

views

why is lower triangular matrix not mentioned in the Jordan normal form definition?

linear-algebra jordan-normal-form

answered 1 hour ago Saucy O'Path 10k

0

votes

0

answers

30

views

Every even integer greater than four is the sum of two non-composite odd integers

elementary-number-theory arithmetic totient-function goldbachs-conjecture

modified 1 hour ago user7013 11

1

vote

1

answer

10

views

Prove that $G∩Cl(A)$⊆ $Cl(G∩A)$ and $Cl(G∩Cl(A))$= $Cl(G∩A)$

metric-spaces

answered 1 hour ago Kavi Rama Murthy 277k

4

votes

2

answers

1k

views

Find all metrics on a set $X$ consisting of two points. Consisting of one point.

real-analysis functional-analysis metric-spaces

modified 1 hour ago Siong Thye Goh 139k

0

votes

0

answers

7

views

Reference of convergence in total variation distance

probability-theory measure-theory reference-request

asked 1 hour ago Tab1e 877

1

vote

0

answers

7

views

Dijkstra's through certain sets of vertices in certain order

graph-theory algorithms trees recursive-algorithms

asked 1 hour ago Manny 55

2

votes

3

answers

138

views

How to solve $\int_0^\pi \frac{x\sin x}{1+ \sin^2 x}dx$?

calculus definite-integrals

answered 1 hour ago Lai 19

-1

votes

0

answers

34

views

how to solve recurrence relation with 2 recurrences

recurrence-relations recursion recursive-algorithms

modified 1 hour ago Alexander Gruber♦ 26.2k

1

vote

1

answer

16

views

Show g is not surjective

analysis functions discrete-mathematics relations

answered 1 hour ago coffeemath 6,184

1

vote

0

answers

17

views

What is a weight of space?

general-topology definition

asked 1 hour ago Tereza Tizkova 937

1

vote

1

answer

46

views

Find the Laplace transform of $\frac{\sin(t)}{\sqrt[3]{t} }$?

integration laplace-transform

modified 1 hour ago Svyatoslav 3,179

0

votes

0

answers

16

views

Advanced solution from any fundamental solution

distribution-theory fundamental-solution

modified 1 hour ago md2perpe 20.9k

0

votes

0

answers

60

views

Can $\frac{a^n+b^n}{a+b}=c^n$ have a solution?

diophantine-equations gcd-and-lcm

modified 1 hour ago Juan Moreno 505

1

vote

0

answers

11

views

Predictable termination of an infinite sequence explaining the convergence of the sequence.

modular-arithmetic collatz-conjecture

modified 1 hour ago dhuwarkesh 11

0

votes

0

answers

10

views

Showing that $\sigma_A (a) = \sigma_C (A).$

operator-algebras banach-algebras spectra

asked 1 hour ago Rabin Kumar Chakraborty 304

0

votes

0

answers

12

views

Finding out the eigenspace of operator $ I(f(x)) := \int_{-x}^x f(y)dy$ over the vector space of all polynomials with odd degree?

integration eigenvalues-eigenvectors

asked 1 hour ago Kritik Agrawal 1

0

votes

0

answers

15

views

What is the representing object of $C(A,-)\times C(B,-)$

category-theory

asked 1 hour ago IsAdisplayName 86

1

vote

1

answer

16

views

A divisor sum involving generalized Moebius function

elementary-number-theory summation mobius-function

answered 1 hour ago Greg Martin 58.4k

1

vote

1

answer

26

views

Bayes' rule example

bayes-theorem

modified 1 hour ago Ryan G 11.5k

1

vote

1

answer

39

views

Change things inside parentheses - Natural deduction

logic propositional-calculus natural-deduction

answered 1 hour ago Ten O'Four 779

2

votes

0

answers

86

views

+500

Should I tick a multiple choice question at random or not in an exam with different weight for correct and wrong answer?

probability

modified 1 hour ago Greg Martin 58.4k

0

votes

0

answers

20

views

Need help with finding values a,b,c and d from this matrix question

linear-algebra matrices matrix-equations

modified 1 hour ago James A 1,914

-1

votes

0

answers

38

views

What do you think of my math self study plan?

self-learning

asked 1 hour ago soju 127

7

votes

1

answer

194

views

+500

Quadratic formula in differential equations

ordinary-differential-equations

modified 1 hour ago Buraian 5,673

0

votes

2

answers

34

views

confusing system of equations question

systems-of-equations word-problem

answered 1 hour ago poetasis 3,893

11

votes

1

answer

248

views

+500

Geometric proof of $\cos A + \cos B + \cos C + \cos (A+B+C) = 4 \cos \frac{A+B}{2} \cos \frac{B+C}{2} \cos \frac{A+C}{2}$

geometry trigonometry complex-numbers vectors

modified 1 hour ago Buraian 5,673

0

votes

1

answer

25

views

Does the torsion submodule and the $0$-th local Cohomology module coincide over local Cohen-Macaulay ring?

commutative-algebra homological-algebra local-rings cohen-macaulay local-cohomology

answered 1 hour ago Evans Gambit 1,519

0

votes

0

answers

3

views

Cyclic elements in filtrations of representations

finite-groups representation-theory filtrations

asked 2 hours ago GossipM 320

0

votes

1

answer

12

views

Partial differential equations related to diffusion

partial-differential-equations boundary-value-problem

modified 2 hours ago The Amplitwist 312

0

votes

0

answers

25

views

Related to PDF of random variable when the random variable is squared?

probability-distributions density-function cumulative-distribution-functions

modified 2 hours ago Saru 3

1

vote

0

answers

12

views

Smoothing arbitrary curve changes

interpolation

asked 2 hours ago TheIgors 11

1

vote

1

answer

22

views

Coordinate independence counter examples.

physics coordinate-systems

answered 2 hours ago stackex33 705

0

votes

1

answer

22

views

Limiting Distribution of $f_{T_n}(t)=8n(1-nt)\mathbb{I}_{(1/2n,1/n)}(t)$

probability-theory probability-distributions

modified 2 hours ago Oliver Diaz 21k

0

votes

0

answers

22

views

Uniqueness of $\mathbb{Z}$-module of a given generating set $A$

discrete-mathematics modules

modified 2 hours ago user10354138 28.9k

0

votes

1

answer

13

views

Independent random sample problem

probability solution-verification random-variables normal-distribution expected-value

answered 2 hours ago Kavi Rama Murthy 277k

3

votes

0

answers

93

views

Proof of supremum of rationals less than $\sqrt 2$

real-analysis analysis proof-writing supremum-and-infimum

modified 2 hours ago Gary 14.6k

2

votes

1

answer

57

views

Evaluate $\int_0^1 \ln(-\ln x)\frac{x^{a}}{\sqrt{-\ln x}}dx$

real-analysis calculus integration

modified 2 hours ago Gary 14.6k

2

votes

0

answers

10

views

Does Asymptotic Stability Imply the Existence of a Lyapunov Function for a Nonlinear System?

stability-in-odes non-linear-dynamics lyapunov-functions

asked 2 hours ago Paul Wintz 171

1

vote

0

answers

17

views

If || . || is a norm over a field, then there exists $\delta$ > 0 such that ||x|| = $\delta$ |x|, where |x| is the absolute value of x.

functional-analysis norm

asked 2 hours ago ARIJIT SINGH 46

1

vote

0

answers

50

views

Find all positive integers $x,y,z$ such that $x!+y!+z!$ is a multiple of $x+y+z$.

algebra-precalculus elementary-number-theory arithmetic

modified 2 hours ago Jitendra Singh 2,127

-1

votes

1

answer

35

views

How to prove this isomorphism?

quotient-spaces ring-isomorphism

answered 2 hours ago Jaycee Zhang 45

-1

votes

1

answer

16

views

combinations and geometry 2009 chord in circle

combinations

answered 3 hours ago Seewoo Lee 13.2k

1

vote

1

answer

877

views

How Can I calculate the standard deviation of a yes/no question?

statistics standard-deviation

modified 3 hours ago CommunityBot 1

1

vote

1

answer

23

views

"Local parametrizations" implying "Local flat" in the two definitions of submanifolds of Euclidean spaces

multivariable-calculus manifolds smooth-manifolds

modified 3 hours ago peek-a-boo 27.8k

0

votes

0

answers

14

views

How to calculate the the number of nonzero for Poisson binomial distribution

probability upper-lower-bounds moment-generating-functions concentration-of-measure

asked 3 hours ago Kelvin_neverKnow 39

0

votes

0

answers

28

views

General Space Markov Chains: Petite sets

probability probability-theory markov-chains

modified 3 hours ago Noe Vidales 965

0

votes

3

answers

56

views

For distinct primes $p,q$, $\Bbb Q(\sqrt[3]{p})\cap\Bbb Q(\sqrt[3]{q}) =\Bbb Q$

abstract-algebra field-theory

answered 3 hours ago Paramanand Singh 76.5k

-1

votes

0

answers

13

views

How i can make a 3 cycles from a even permutation which contain a cycle of length greater than 3??

group-theory permutations permutation-cycles

asked 3 hours ago Kushal 1

0

votes

0

answers

20

views

Tangent space of fiber bundle (or vector bundle)

smooth-manifolds fiber-bundles

modified 3 hours ago Kajelad 11.5k

5

votes

0

answers

160

views

+50

Evaluation of ${\sum\limits_{\Bbb N} (\text {ker}(x)+\text{kei(x)})=\sum\limits_1^\infty \text K_0\left(\sqrt ix\right)= 0.133691… - 0.7256312… i}$?

sequences-and-series complex-numbers special-functions bessel-functions trigonometric-integrals

modified 3 hours ago Tyma Gaidash 3,014

0

votes

0

answers

13

views

Is the cantor function a fractal projected in 1D?

projective-geometry fractals cantor-set

asked 3 hours ago fecoja 1

2

votes

0

answers

33

views

Can we retrieve $X$ from its odd moments?

probability moment-problem

modified 3 hours ago lamlame 329

0

votes

0

answers

16

views

Distribution of inverse matrix entries from a matrix with entries distributed iid U(0,1)

statistics

asked 4 hours ago dsmalenb 321

0

votes

0

answers

26

views

How to know the positivity of a given polynomial

real-analysis analysis algebraic-geometry operator-theory operator-algebras

asked 4 hours ago user52523 1,041

0

votes

0

answers

19

views

Number Fields (Marcus) page 16 Some Applications

algebraic-number-theory

asked 4 hours ago no lemon no melon 1,919

0

votes

0

answers

14

views

Construct an arrangement of numbers that the absolute value of differences between adjacent numbers are all different

permutations contest-math

asked 4 hours ago Ichungchen 130

0

votes

0

answers

7

views

Variation and Probability - Chances of possible outcomes

probability multivariable-calculus calculus-of-variations variance

asked 4 hours ago Stan Daily 1

2

votes

0

answers

13

views

A sufficient condition for being of the second category

functional-analysis analysis metric-spaces

asked 4 hours ago Mutasim Mim 519

0

votes

0

answers

15

views

Why can't I get the right stationary vector for this markov chain

matrices markov-chains matrix-equations markov-process

asked 4 hours ago Dieter Brow 47

0

votes

0

answers

25

views

Expected time in card shuffling problem

probability-theory stochastic-processes permutations random-walk

modified 4 hours ago user525966 4,917

10

votes

1

answer

3k

views

Vertices of a cyclic polygon have integer coordinates and sides. If odd $n$ divides the squares of the sides, it divides twice the area.

geometry elementary-number-theory contest-math analytic-geometry polygons

modified 5 hours ago CommunityBot 1

0

votes

1

answer

13

views

How can I compute a rotation-invariant angle of a vector connecting two other vectors?

vectors rotations

answered 5 hours ago mhdadk 467

34

votes

1

answer

2k

views

What are ways to compute polynomials that converge from above and below to a continuous and bounded function in $[0,1]$?

probability polynomials uniform-convergence approximation-theory simulation

modified 6 hours ago Peter O. 671

1

vote

3

answers

4k

views

Do collinear lines or overlapping collinear line segments intersect?

geometry euclidean-geometry

modified 6 hours ago CommunityBot 1

-1

votes

0

answers

21

views

Prove that Aff(X) = Aff( Conv(X) )

general-topology convex-analysis

asked 6 hours ago frenchstudent00 1

4

votes

0

answers

39

views

Ask for a proof of logarithmically complete monotonicity of a power-exponential function involving the difference of the psi and logarithmic functions

convex-analysis special-functions laplace-transform digamma-function polygamma

modified 6 hours ago qifeng618 571

1

vote

0

answers

41

views

Where does this inequality come from?

combinatorics inequality graph-theory binomial-coefficients

asked 7 hours ago CTVK 343

16

votes

8

answers

851

views

About the integral $\int_{0}^{1}\frac{\log(x)\log^2(1+x)}{x}\,dx$

calculus integration definite-integrals improper-integrals polylogarithm

answered 8 hours ago Quanto 61k

1

vote

2

answers

946

views

Prove that $\sqrt{x}{\sin \frac1x}$ is uniformly continuous at $(0, \infty)$

functions continuity

modified 8 hours ago CommunityBot 1

1

vote

1

answer

48

views

Can every bilinear map be represented as $B(x, y) = A(x)y$?

linear-algebra linear-transformations

modified 9 hours ago Jean Marie 59k

9

votes

3

answers

277

views

If a separately continuous function $f : [0,1]^2 \to \mathbb{R}$ vanishes on a dense set, must it vanish on the whole set?

real-analysis analysis multivariable-calculus continuity

answered 9 hours ago Adayah 8,509

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