Mathematics Stack Exchange

0

votes

0

answers

9

views

Properties of double sum containing primes:

summation prime-numbers zeta-functions analytic-continuation summation-method

modified 1 min ago Zaza 11

0

votes

0

answers

9

views

An elliptic system? Or other type of equation?

partial-differential-equations elliptic-equations

modified 3 mins ago Arctic Char 6,195

7

votes

1

answer

63

views

Compute close-form of $\int_0^{\frac\pi2}\frac{dt}{\sin t+\cos t+\tan t+\cot t+\csc t+\sec t}$

integration trigonometric-integrals

answered 5 mins ago Alexander Conrad 317

1

vote

0

answers

32

views

Reference for things “locally looking like” objects in a site?

algebraic-geometry category-theory sheaf-theory grothendieck-topologies

modified 5 mins ago Curious 151

0

votes

0

answers

3

views

Can the perimeter of ellipse be expressed by a matrix exponential

geometry matrix-exponential elliptic-integrals

asked 6 mins ago Paul Zhang 77

0

votes

0

answers

6

views

Probability of winning a patience game

probability combinatorial-game-theory

asked 6 mins ago Julius J. Groenjes 1

0

votes

0

answers

15

views

Calculating velocity and position with integrals

definite-integrals

modified 7 mins ago Sebastiano 3,824

0

votes

2

answers

22

views

Lower limit of supremum of sequence of continuous functions

real-analysis limits

answered 7 mins ago Danny Pak-Keung Chan 7,441

0

votes

0

answers

3

views

Projecting into a subspace which transforms under a reducible representation of a symmetry group

linear-algebra matrices symmetry projection-matrices

asked 7 mins ago Serge Carrefax 21

0

votes

0

answers

7

views

About the convexity parameter of a multivariate function

real-analysis analysis optimization convex-analysis

modified 8 mins ago Minsik Seo 13

1

vote

0

answers

4

views

A proof concerning the gradient theorem

calculus analysis vector-analysis divergence-theorem

asked 8 mins ago Gabriele Privitera 43

1

vote

0

answers

10

views

Leapfrog method

numerical-methods

modified 9 mins ago Sebastiano 3,824

0

votes

0

answers

17

views

Minimal Dimension of a Certain Subspce in $\bigwedge^2 \mathbb R^n$, (from another post, need explanation)

vector-spaces tensor-products multilinear-algebra exterior-algebra

modified 9 mins ago Physor 2,554

0

votes

1

answer

13

views

How to solve this PDE $(x-y)\partial_x\partial_yu-\partial_xu+\partial_yu=0$

partial-differential-equations

answered 9 mins ago J.G. 101k

1

vote

0

answers

21

views

+200

Parabolic equations without compatibility conditions

partial-differential-equations parabolic-pde

modified 11 mins ago Yuval 2,339

6

votes

2

answers

44

views

Prove that the given sequence contains all natural numbers

sequences-and-series elementary-number-theory contest-math

answered 11 mins ago K.defaoite 5,306

1

vote

1

answer

38

views

Procedure or technique or reasoning to get $2+4h$?

algebra-precalculus trigonometry education

modified 12 mins ago Bright Star 400

0

votes

0

answers

19

views

Completing at different ideals and obtaining isomorphic completed rings

abstract-algebra commutative-algebra power-series elliptic-curves modular-forms

modified 13 mins ago Descartes Before the Horse 5,814

0

votes

0

answers

5

views

Similarity Transformation when the Linear Operator is not written in the standard basis doesn’t lead to a Diagonal Matrix. Why?

linear-algebra linear-transformations diagonalization normal-operator

asked 13 mins ago Shashaank 813

2

votes

0

answers

6

views

Determining general O(2)-equivariant ODE

ordinary-differential-equations lie-groups symmetry

asked 15 mins ago arnold 41

0

votes

0

answers

15

views

Prove that the group $A’ = \{x \in R^k \mid x \in \partial (A/\{x\})\} $ is closed

real-analysis calculus group-theory analysis

modified 16 mins ago Alon 1,537

4

votes

1

answer

203

views

+50

If $x,y,z>0$, prove that: $\frac{x}{y+z}+\frac{y}{x+z}+\frac{z}{x+y}\ge \sqrt{2}\sqrt{2-\frac{7xyz}{(x+y)(y+z)(x+z)}}$

inequality contest-math intuition a.m.-g.m.-inequality

modified 17 mins ago Yuri Negometyanov 21.3k

0

votes

0

answers

34

views

Is there a name for this problem or any close problem?

elementary-set-theory optimization terminology products

modified 17 mins ago RobPratt 21.8k

0

votes

0

answers

5

views

Find subdifferential of function

calculus nonlinear-optimization subgradient

asked 18 mins ago Hrackadont 447

0

votes

0

answers

23

views

irrarional numbers and their propertirs

real-analysis irrational-numbers

asked 19 mins ago Parvez Patel 79

2

votes

1

answer

40

views

Generating Function for Recursive Sequences (generalization to the binomial series)

recurrence-relations power-series generating-functions

modified 20 mins ago René Gy 2,240

1

vote

1

answer

19

views

locus of points with sum of distance

algebra-precalculus

modified 23 mins ago Anay Aggarwal 342

0

votes

0

answers

7

views

How do I find the sum of a Fourier series around x=0?

sequences-and-series summation fourier-series

asked 24 mins ago Jakke 87

0

votes

0

answers

6

views

Question about expectation and conditional expectation in pmf

probability probability-theory probability-distributions expected-value

asked 24 mins ago Ben 13

0

votes

0

answers

7

views

What is the purpose of detecting non-free projective modules?

abstract-algebra ring-theory k-theory algebraic-k-theory

asked 24 mins ago user873295 47

1

vote

0

answers

10

views

Unsure about what expressions to multiply with constants in partial fraction decomposition

fractions

modified 24 mins ago Bernard 163k

4

votes

0

answers

20

views

How many partitions of composite numbers into composite numbers are there?

combinatorics number-theory graph-theory generating-functions

modified 24 mins ago Hans-Peter Stricker 16.2k

0

votes

0

answers

4

views

Product of Hermitian operators

adjoint-operators sturm-liouville

asked 25 mins ago Vinicius Fuckner Linhares 61

-1

votes

0

answers

11

views

$\operatorname End_{\mathbb C}(\mathbb C^2) = M_2 (\mathbb C)$

linear-algebra ring-homomorphism

asked 25 mins ago stoppedbrain 9

1

vote

0

answers

7

views

Jacobian of matrix product from the right and left

jacobian

asked 27 mins ago Saeed 3,708

-1

votes

0

answers

11

views

Affine mapping and hyperplanes

linear-algebra abstract-algebra affine-geometry

modified 28 mins ago Falq 263

0

votes

0

answers

11

views

How do you determine where the cdf has a jump?

cumulative-distribution-functions

modified 28 mins ago tappis 1

0

votes

1

answer

15

views

Find all real x and y that satisfy the equation.

algebra-precalculus number-theory

answered 29 mins ago Robert Israel 401k

0

votes

1

answer

10

views

partial ordering in weight lattice

combinatorics representation-theory lie-groups lie-algebras algebraic-groups

answered 29 mins ago F. C. 335

2

votes

0

answers

8

views

Is a convex cone generated by a bounded convex closed set containing the origin closed?

convex-cone

modified 29 mins ago Alexey Kushnir 41

0

votes

0

answers

18

views

Vanishing covariant derivative of a vector field

differential-geometry tensors vector-fields connections

modified 36 mins ago Jorge Casajus 37

2

votes

1

answer

26

views

Calculating integral (actually calculating Fourier transform)

calculus integration complex-analysis fourier-analysis

answered 37 mins ago peek-a-boo 18.6k

5

votes

1

answer

214

views

+100

How to approximate a sharply peaked function with deltas?

integration asymptotics distribution-theory approximation-theory

modified 39 mins ago Han de Bruijn 14.9k

0

votes

0

answers

27

views

Compute the discriminant of the polynomial $f(x)=ax^2+bx+c$

algebraic-geometry

modified 39 mins ago Gary 9,090

0

votes

1

answer

23

views

Fractional Infinite Power Tower

calculus exponentiation

modified 42 mins ago pawel 534

0

votes

0

answers

20

views

Area using double integral

multivariable-calculus area multiple-integral

modified 45 mins ago Arctic Char 6,195

0

votes

1

answer

19

views

Finding the Bound of the Error in Interpolation

functions polynomials numerical-methods interpolation error-function

answered 46 mins ago Paul Sinclair 31.6k

0

votes

1

answer

8

views

How does a morphism in a distinguished triangle induce an element of $\operatorname{Ext}^{2}$

algebraic-geometry homological-algebra sheaf-cohomology triangulated-categories

answered 50 mins ago Sasha 9,528

0

votes

0

answers

16

views

Are bounded subsets of $\mathbb{R}^n$ finitely measurable with a continuous measure?

measure-theory

modified 50 mins ago Héctor 500

0

votes

0

answers

3

views

efficient way to find one extreme point of a Zonotope in high dimension

convex-geometry discrete-geometry

asked 53 mins ago peng yu 607

0

votes

1

answer

44

views

+100

Non-trivial theorems on the roots of $P+Q$ for polynomials $P,Q$

polynomials reference-request roots

modified 54 mins ago Descartes Before the Horse 5,814

4

votes

1

answer

32

views

Sum of powers in multiple ways

number-theory diophantine-equations

answered 54 mins ago player3236 15.7k

-1

votes

0

answers

9

views

Show that $F(I_n)$ is a regular value of $F$

differential-geometry euclidean-geometry smooth-manifolds

modified 56 mins ago Kenny Lau 22.8k

0

votes

0

answers

8

views

Differential equation satisfying three curves

ordinary-differential-equations derivatives curves

modified 57 mins ago Harikrishnan R 3

0

votes

0

answers

3

views

equivalence of linear codes?

cryptography coding-theory

asked 1 hour ago mathsnerd22 85

0

votes

0

answers

4

views

Solving homogeneous Cauchy-Euler ODE for $t<0$

ordinary-differential-equations

asked 1 hour ago CalebWilliamsUIC 171

5

votes

0

answers

194

views

+50

Solving the recurrence $f_n(x)=f_{n-1}(x-1)+\frac1\pi\int_{x-1}^{x+1}\frac{df_{n-1}(t)}{dt}\cos^{-1}(\frac{1+t^2-x^2}{2t})dt$

calculus recurrence-relations 3d integral-equations

modified 1 hour ago Tavish 9,970

3

votes

1

answer

30

views

Graph puzzles: Constructing graphs from tiles

graph-theory algorithms puzzle random-graphs searching

modified 1 hour ago Hans-Peter Stricker 16.2k

1

vote

0

answers

19

views

Calculate volume of three-dimensional shape knowing the surface areas

geometry

modified 1 hour ago siebe de klerk 11

0

votes

0

answers

11

views

Rotation angle of an eigenvector basis

linear-algebra matrices geometry eigenvalues-eigenvectors vectors

asked 1 hour ago Physics_Student 59

0

votes

0

answers

9

views

Ellipse Equation of 2D Gaussian Contour

geometry statistics normal-distribution conic-sections

modified 1 hour ago Physics_Student 59

1

vote

0

answers

11

views

Dimension of vector space of affine functions

linear-algebra abstract-algebra affine-geometry

modified 1 hour ago Falq 263

0

votes

0

answers

7

views

Maximal non-singular restrictions of a bilinear form

linear-algebra bilinear-form

asked 1 hour ago sagnik chakraborty 267

0

votes

0

answers

9

views

Find solutions for $v_{tt}-v_{xx}-v_x=0$, what to do with complex solutions?

partial-differential-equations

modified 1 hour ago AColoredReptile 2,309

1

vote

1

answer

13

views

Algebra question involving quadratic

algebra-precalculus

answered 1 hour ago egreg 215k

3

votes

1

answer

21

views

Trigonometric Manipulation with inequality:$x^2 \cos \theta - x(1 - x) + (1 - x)^2 \sin \theta > 0.$

trigonometry

answered 1 hour ago Arnaldo 19.9k

0

votes

0

answers

22

views

Find R(T) and N(T)

linear-transformations

modified 1 hour ago Karam 11

0

votes

0

answers

5

views

Definition of semimartingale and stochastic integration

stochastic-processes stochastic-calculus stochastic-integrals stochastic-analysis

asked 1 hour ago Johhn White 33

1

vote

0

answers

25

views

Is there an easy way to picture a Whitney embedding?

differential-geometry differential-topology smooth-manifolds

modified 1 hour ago aldo decristo 575

0

votes

0

answers

13

views

Independence between two Poisson processes

probability independence poisson-process

modified 1 hour ago Bernard 163k

1

vote

2

answers

44

views

Finding equilibrium point from a differential equation

calculus ordinary-differential-equations derivatives

answered 1 hour ago Robert Lewis 64.8k

1

vote

1

answer

18

views

Finding the value of C in probability density function

probability integration

answered 1 hour ago Tharindu Gimras 106

2

votes

0

answers

26

views

Is there a differentiable real function so that no tangent line of $f$ is “undisturbed” by other points of $f$ (in some neighbourhood).

real-analysis derivatives graphing-functions

modified 1 hour ago Adam Rubinson 5,194

0

votes

0

answers

15

views

Calculating walks above the x axis

combinatorics random-walk

asked 1 hour ago Alfred Hampton 11

1

vote

0

answers

10

views

gradient updates on space of matrices

matrices differential-geometry lie-groups gradient-descent

asked 1 hour ago Ziofil 1,378

0

votes

2

answers

31

views

How should I glue together the sides of the complex plane when adding a “single point” at infinity?

general-topology riemann-sphere

modified 1 hour ago Henno Brandsma 193k

134

votes

0

answers

2k

views

Does every ring of integers sit inside a ring of integers that has a power basis?

number-theory ring-theory algebraic-number-theory

modified 1 hour ago NN2 2,624

0

votes

0

answers

8

views

normally hyperbolic invariat manifold

differential-geometry dynamical-systems

asked 1 hour ago Giuseppe Tenaglia 191

0

votes

0

answers

18

views

Is the signature of a matrix with a “Zero Quadrant” always zero?

linear-algebra matrices

modified 1 hour ago N. Owad 5,784

2

votes

0

answers

9

views

Weak and strong convergence on $W^{1,N}(\mathbb{R}^N)$

sobolev-spaces weak-convergence pointwise-convergence

modified 35 secs ago Nora Nour 47

0

votes

0

answers

8

views

Pythagoras Tree Mathematical function?

functions recursive-algorithms fractals pythagorean-triples

asked 1 hour ago Prometheus 113

0

votes

0

answers

8

views

Proximal operator intuition

optimization convex-analysis convex-optimization

asked 2 hours ago RFTexas 317

2

votes

3

answers

78

views

If $u\otimes v_1 = v_2\otimes u$; $v_1,v_2,u \in V-\{0\}$ then $v_1 = v_2$?

linear-algebra

answered 2 hours ago user2345678 2,336

0

votes

0

answers

11

views

Integral analysis of random variable

integration random-variables indefinite-integrals random-functions

asked 2 hours ago Apacs 21

0

votes

0

answers

8

views

Given a random sample from a triangular distribution, what is the MLE of $\alpha$?

probability density-function maximum-likelihood

asked 2 hours ago thedumbkid 513

1

vote

0

answers

16

views

If integrating with respective to full circle which limit we should use?

integration

modified 2 hours ago vitamin d 2,537

1

vote

0

answers

16

views

using finitely generated in proof.

modules finitely-generated

asked 2 hours ago MathFear 89

1

vote

0

answers

15

views

Properties of Chern-Fulton's class

algebraic-geometry

modified 2 hours ago Arctic Char 6,195

1

vote

0

answers

12

views

Comparing Hamiltonians - Quantum harmonic oscillator

linear-algebra quantum-mechanics adjoint-operators quantum-field-theory self-adjoint-operators

modified 2 hours ago Sven456 104

1

vote

0

answers

19

views

Two-way ANOVA for machine learning model analysis.

statistics machine-learning data-analysis anova

asked 2 hours ago Ramon 123

0

votes

0

answers

7

views

Determine the tangent space $T_{x^\ast}\{g\le0\}$ of $\{g\le0\}$ at a regular point $x^\ast$ of $g$

differential-geometry manifolds smooth-manifolds karush-kuhn-tucker tangent-spaces

asked 2 hours ago 0xbadf00d 11.3k

1

vote

0

answers

15

views

Help on how to do asymptotic expansions 'in general'

analysis

asked 2 hours ago user6376297 295

1

vote

0

answers

12

views

reference request: Borel measure is Gaussian iff Fourier transform involves positive definite bilinear form

functional-analysis measure-theory reference-request fourier-transform topological-vector-spaces

modified 2 hours ago G. Chiusole 4,695

2

votes

1

answer

30

views

$\int_0^1f(x)dx= \lim_{c\rightarrow0}\int_c^1f(x)dx$

real-analysis analysis riemann-integration

answered 2 hours ago Scilife 370

0

votes

0

answers

12

views

any information about UMVUE of $θ$ in $0<θ<1,P(x=−1)=θ,P(x∈\{0,1,2,3,⋯\})=(1−θ)^{2}θ^{x} $

probability statistics variance density-function estimator

modified 2 hours ago wiliam mercer 1

1

vote

0

answers

7

views

Cost function calculating best coefficient why differentiate then integrate to equal zero

calculus fourier-series

asked 3 hours ago ramon22 45

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