Mathematics Stack Exchange

0

votes

0

answers

3

views

Differentiate each term separately question

calculus sequences-and-series

asked 50 secs ago Lilo 371

4

votes

0

answers

55

views

Understanding step four in the excision theorem (Hatcher - algebraic topology).

algebraic-topology proof-explanation homology-cohomology homological-algebra simplex

modified 1 min ago user839372 335

3

votes

1

answer

40

views

Defining Connection in Hom Vector Bundle without Coordinates, using Dieudonne's Definition

differential-geometry vector-bundles connections

modified 2 mins ago Kajelad 9,981

0

votes

0

answers

5

views

Why does covariance $P$ matrix become non positive definite in Unscented Kalman Filter?

control-theory covariance optimal-control filters kalman-filter

asked 4 mins ago Daniel Mårtensson 2,359

1

vote

2

answers

25

views

Equivalent definition of homeomorphic spaces

general-topology

answered 4 mins ago C Squared 2,835

0

votes

2

answers

18

views

Counting the number of ways to paint the houses

combinatorics combinations

modified 5 mins ago Bulbasaur 1,275

1

vote

0

answers

11

views

Approximation of integral of gaussian function over a parallelepiped

numerical-methods approximation gaussian-integral approximate-integration

modified 6 mins ago NN2 5,168

0

votes

0

answers

4

views

Every non abelian group of order 6 is isomorphic to $\displaystyle S_{3}$ (the symmetry group of order 6).

group-theory group-isomorphism

asked 7 mins ago Koro 5,761

0

votes

0

answers

5

views

a corollary of dickson's lemma!

algebraic-geometry monomial-ideals

asked 7 mins ago hosseinsh 73

0

votes

1

answer

6

views

Invariance & Eigenvalue(s) in finite dimensional vector spaces

linear-algebra matrices eigenvalues-eigenvectors linear-transformations invariant-subspace

answered 8 mins ago Timur Bakiev 986

0

votes

0

answers

5

views

Resources for asymptotic analysis in analytic number theory?

reference-request asymptotics analytic-number-theory

modified 8 mins ago Max Muller 4,633

0

votes

1

answer

39

views

Ellipse to ellipse distance

geometry trigonometry

modified 10 mins ago zwim 21.7k

0

votes

0

answers

5

views

Deriving Gauss-Hermite weights

numerical-methods orthogonal-polynomials approximate-integration

asked 10 mins ago Carlo 53

0

votes

0

answers

16

views

Find the volume between the two surfaces.

integration multivariable-calculus volume

modified 11 mins ago Math Lover 25.2k

0

votes

0

answers

2

views

Diagrammatic representation of three logical statements

logic graphing-functions

asked 12 mins ago Mike 11

0

votes

0

answers

24

views

How to use $-1$ in some form instead of $e^i$ to represent a $1$ radian rotation

complex-numbers rotations

modified 14 mins ago Aaron Hendrickson 2,556

0

votes

0

answers

14

views

Quantile function of $fx) = 3x^2 \cdot 1_{[0,1]}(x)$

probability probability-theory probability-distributions

modified 16 mins ago Lucian 779

-3

votes

0

answers

16

views

What are some concepts in mathematics that may or may not exist in the real world?

philosophy

asked 16 mins ago bohan 1

1

vote

1

answer

15

views

Convex Envelope for $f(x) = (1-x^2)^2$

real-analysis convex-analysis calculus-of-variations

modified 20 mins ago Martin R 70.5k

2

votes

1

answer

63

views

+50

Showing the data processing inequality

probability statistics cauchy-schwarz-inequality jensen-inequality

modified 23 mins ago Thomas 1,913

3

votes

1

answer

103

views

+100

Confused about Brownian motion on Riemannian manifold

riemannian-geometry brownian-motion stochastic-differential-equations

modified 23 mins ago AlephBeth 427

2

votes

1

answer

12

views

Sequence of exponential random variables

probability-theory probability-distributions

answered 23 mins ago Kavi Rama Murthy 264k

0

votes

0

answers

8

views

Distribution of sample variance with equal correlation

statistics probability-distributions chi-squared

modified 24 mins ago Tom Chan 1

0

votes

0

answers

12

views

Given the distance measure for two points and the point $p = (0,2)$, which of the following points have the same distance as $p$ from the origin?

algebra-precalculus statistics machine-learning data-mining

modified 24 mins ago Neil hawking 1,585

1

vote

0

answers

15

views

Why do we care about optimal generating matrices?

coding-theory

modified 25 mins ago Saegusa 353

0

votes

0

answers

2

views

Maximum principle for a particular kind of (parabolic) integro-differential equation

maximum-principle parabolic-pde integro-differential-equations

asked 25 mins ago Aguazz 83

1

vote

1

answer

14

views

Integral when absolute inequality holds

integration limits convergence-divergence improper-integrals

answered 33 mins ago Kavi Rama Murthy 264k

0

votes

0

answers

19

views

On eigenvalues of compact operators on normed spaces

operator-theory normed-spaces spectral-theory compact-operators

modified 34 mins ago ric.san 325

0

votes

1

answer

13

views

Proving the uniqueness of a vector

linear-transformations inner-products orthonormal

modified 34 mins ago Timur Bakiev 986

1

vote

1

answer

16

views

Can't find a proper unitary operator $L^2[0,\frac{\pi}{2}]\to L^2[0,+\infty)$

functional-analysis

modified 35 mins ago Neil hawking 1,585

-1

votes

0

answers

16

views

Coin tossing probability, but on a space-ship?

probability metric-spaces manifolds

modified 42 mins ago vitamin d 4,730

0

votes

1

answer

19

views

$3\times3$ Game Theory Problem without numeric numbers

optimization game-theory

modified 44 mins ago vitamin d 4,730

5

votes

0

answers

166

views

+50

An estimate for singular integral.

sobolev-spaces harmonic-analysis singular-integrals

modified 44 mins ago 1147 27

0

votes

0

answers

15

views

$\operatorname{Spin}^+(s,t)$ is a group

abstract-algebra group-theory clifford-algebras spin-geometry

modified 47 mins ago vitamin d 4,730

0

votes

0

answers

13

views

Prove that $(x) (P(x) → (Q(y) ∧ R(x))) , (∃x)(P(x)) ⇒ Q(y) ∧ (∃x)(P(x) ∧ R(x))$

predicate-logic

modified 48 mins ago vitamin d 4,730

0

votes

0

answers

12

views

Relation between force, vectors and coordinates

geometry vectors physics

modified 50 mins ago vitamin d 4,730

0

votes

0

answers

11

views

Maximum deviation of a Brownian bridge with respect to initial condition

inequality stochastic-processes brownian-bridge

modified 50 mins ago Aguazz 83

0

votes

1

answer

20

views

counting the number of sequences in which number $t$ should place after $(t+1)$ or $(t-1)$ appears except first number

probability combinatorics discrete-mathematics permutations combinations

modified 51 mins ago Dumb Scientist 29

0

votes

0

answers

8

views

Almost invariant vs invariant in the strict sense.

real-analysis probability probability-theory measure-theory ergodic-theory

modified 51 mins ago José Carlos Santos 342k

0

votes

0

answers

18

views

For each natural number $n \geq 1$, let $a_n = \frac{n}{10^[\log_{10}n]}$ , where $[x]$ = smallest integer greater than or equal to $x$.

real-analysis sequences-and-series limsup-and-liminf

modified 51 mins ago vitamin d 4,730

0

votes

0

answers

15

views

How to solve a matrix differential equation where differentiable function is the matrix?

partial-differential-equations numerical-methods

modified 51 mins ago vitamin d 4,730

1

vote

1

answer

25

views

Geometric interpretation of discriminant of a number field (and reference suggestion)

algebraic-geometry reference-request algebraic-number-theory discriminant

answered 59 mins ago hm2020 3,428

0

votes

0

answers

15

views

How many positive integers will not have the form 9nx+5n before 1 and any positive integer N?

elementary-number-theory

modified 1 hour ago Bill Dubuque 248k

-1

votes

1

answer

29

views

Ext vanishing for locally free sheaves

algebraic-geometry sheaf-theory vector-bundles

answered 1 hour ago hm2020 3,428

1

vote

0

answers

25

views

Proof of the fact that $\{ x \in \mathbb{R^n} | f(x)\neq g(x) \}$ is lebesgue-measurable.

lebesgue-measure measurable-functions measurable-sets

asked 1 hour ago EPA 853

0

votes

1

answer

26

views

Polynomial representation of $GL(V)$: definition and examples.

representation-theory

answered 1 hour ago Hagen von Eitzen 346k

-1

votes

0

answers

15

views

Is the following a vector Subspace?

linear-algebra vector-spaces vectors

asked 1 hour ago Janmajey Pargaien 1

4

votes

0

answers

30

views

Prove/Refute the following claim about convolution

laplace-transform convolution

modified 1 hour ago Giulio 512

4

votes

1

answer

682

views

Why is a connected planar graph isomorphic to its double dual?

graph-isomorphism planar-graphs

modified 1 hour ago Lele99_DD 250

1

vote

3

answers

21

views

Double integral of an off-centered circle.

multivariable-calculus polar-coordinates multiple-integral

answered 1 hour ago Math Lover 25.2k

0

votes

0

answers

13

views

Find a CFG for $(0 \cup10)^*(1+\epsilon)$

solution-verification context-free-grammar

modified 1 hour ago Frederick Manfred 457

0

votes

0

answers

12

views

Verification of a proof regarding tangent ratio of sum of $n$ angles

trigonometry solution-verification

asked 1 hour ago snehamayee sahu 61

0

votes

0

answers

12

views

Limit of a composite function approaching infinity.

limits functions function-and-relation-composition

asked 1 hour ago 1147 27

0

votes

0

answers

9

views

Finding unique permutations up to cyclic permutation (not sure if this the right term)

combinatorics

modified 1 hour ago vitamin d 4,730

1

vote

3

answers

52

views

Prove that ${\sqrt i} ^ {\sqrt i} = e^{-\alpha}\operatorname{cis} \alpha$ , where $\alpha = \frac {π}{4 \sqrt 2}$

complex-analysis complex-numbers logarithms exponentiation

modified 1 hour ago José Carlos Santos 342k

0

votes

0

answers

5

views

Splitting of rank 2 torsion-free sheaf on surface

algebraic-geometry coherent-sheaves

asked 1 hour ago Peter Liu 641

0

votes

0

answers

17

views

Concavity of a function related to the Brunn-Minkowski inequality

convex-analysis convex-geometry

modified 1 hour ago toyr99 1

1

vote

1

answer

13

views

Factorisation of A Transpose

matrices transpose

answered 1 hour ago Siong Thye Goh 135k

1

vote

0

answers

15

views

Are all embeddings of varieties essentially the same?

algebraic-geometry polynomials schemes projective-schemes

asked 1 hour ago Andy 1,536

0

votes

0

answers

45

views

The commutative degree of finite groups

group-theory finite-groups

modified 1 hour ago M.Ramana 1,149

0

votes

0

answers

33

views

Difficulties with trigonometry question - please tell me there's a better way

trigonometry

modified 1 hour ago Saad 28.4k

0

votes

0

answers

14

views

Arrange equation so that $b$ is included in factors

algebra-precalculus

modified 2 hours ago Saad 28.4k

0

votes

0

answers

34

views

+50

Derivative of the inner product of Jacobi fields and it's derivative

differential-geometry riemannian-geometry

modified 2 hours ago Lost 333

2

votes

1

answer

35

views

How do I deal with finding a partition for a specific epsilon?

real-analysis functions solution-verification

modified 2 hours ago gpassante 672

0

votes

0

answers

3

views

Optimal ordering policy in inventory model

linear-programming

asked 2 hours ago simran 1

2

votes

0

answers

10

views

Proving that $I_{m\geq S}E(X\mid \mathcal{F}_{S})$ is $\mathcal{F}_{S\wedge m}$ measurable

probability-theory stochastic-processes

asked 2 hours ago An old man in the sea. 4,244

3

votes

2

answers

64

views

What is the least common factor in equation $\frac{5}{x+4}=4+\frac{3}{x-2}$

algebra-precalculus fractions

modified 2 hours ago José Carlos Santos 342k

1

vote

0

answers

16

views

Regularization for function in $S^{d-1}$

real-analysis convolution weak-convergence periodic-functions regularization

modified 2 hours ago JRT 11

0

votes

0

answers

8

views

Intuitive explanation of quiver $Q^{(n,s)}$.

combinatorics representation-theory quiver

asked 2 hours ago Puvas 950

0

votes

0

answers

10

views

Product manifolds in Dieudonné, Vol. 3

differential-geometry manifolds product-space

asked 2 hours ago Roland Salz 333

0

votes

0

answers

9

views

Character group of a finite field extension of Q

extension-field p-adic-number-theory characters

asked 2 hours ago Learner 1

24

votes

1

answer

864

views

About the inequality $x^{x^{x^{x^{x^x}}}} \ge \frac12 x^2 + \frac12$

real-analysis calculus inequality

modified 2 hours ago Erik Satie 3,140

0

votes

0

answers

10

views

Poisson equation with radial function

partial-differential-equations elliptic-equations poissons-equation

asked 2 hours ago KrzysztofB 122

0

votes

0

answers

18

views

Circles of symmetry and hyperbolic center of 3 circles

geometry circles hyperbolic-geometry mobius-inversion

modified 2 hours ago Svyatoslav Usachev 1

-1

votes

1

answer

16

views

Convergence Radius of a Taylor Series

calculus sequences-and-series power-series taylor-expansion

modified 2 hours ago CalculusLover 401

0

votes

0

answers

17

views

Prove or disprove that there exists no more specific match-ups involving these 4 third-placed teams for the round of 16 other than

discrete-mathematics graph-theory generating-functions matching-theory algorithmic-game-theory

modified 3 hours ago haidangel 1,190

2

votes

0

answers

17

views

What is the average number of moves it takes to solve every 3x3 rubik’s cube position if only random moves are made?

probability average rubiks-cube

asked 3 hours ago Hunter G 31

1

vote

0

answers

33

views

What are good curve fitting methods for highly non linear functions in the interval $[0, 1]$

numerical-methods approximation curves numerical-optimization

modified 3 hours ago Claude Leibovici 191k

0

votes

0

answers

8

views

A connected graph G of order at least 4 such that every edge belongs to a 1-factor of G is 2-connected

graph-theory

asked 3 hours ago Ravi 1

3

votes

1

answer

51

views

+50

Does the derivative of a polynomial over an ordered ring behave like a rate of change?

derivatives polynomials ring-theory ordered-rings

answered 3 hours ago J.-E. Pin 31.7k

2

votes

1

answer

28

views

A question about retraction of the torus onto the cylinder.

algebraic-topology retraction

modified 3 hours ago shoteyes 391

1

vote

0

answers

9

views

Analysis of a particular instance of a non-linearsystem of equations

abstract-algebra vector-spaces systems-of-equations problem-solving nonlinear-system

modified 3 hours ago Ferran Riera Sàbat 11

1

vote

0

answers

11

views

Solvability of a 9-card puzzle game with a similar concept as a rubik's cube

puzzle rubiks-cube

asked 3 hours ago Alberto M 11

1

vote

1

answer

22

views

Generic Points, Associated Points on $\operatorname{Spec} A$ for an Integral

algebraic-geometry commutative-algebra

answered 3 hours ago KReiser 39.2k

0

votes

0

answers

5

views

If one does voxelization in several parts, then are sum-based properties same as from non-partitioned voxelization?

discrete-mathematics

asked 3 hours ago mavavilj 6,508

1

vote

0

answers

15

views

Solving advection-diffusion equation $ P_t (x,t) = DP_{xx} -V P_x$ for $P_t(x,t=0)=-V\delta'(x)$.

partial-differential-equations physics boundary-value-problem heat-equation initial-value-problems

modified 4 hours ago kevinkayaks 552

0

votes

0

answers

10

views

L21 norm closed form

closed-form

asked 4 hours ago Mohammad 3

3

votes

0

answers

35

views

Finding the sum of n terms of a trigonometric series

sequences-and-series trigonometry

asked 4 hours ago noobpro79 31

2

votes

0

answers

20

views

Let $\sigma,\tau$ be stopping times. $\{\sigma<\tau\}\in\mathcal{F}_{\sigma}$?

probability probability-theory measure-theory stopping-times filtrations

asked 4 hours ago stievie 131

4

votes

3

answers

57

views

Showing $\lim_{h \to 0} \frac{\|a+h\| - \bigg(\|a\| + \frac{a\cdot h}{\|a\|}\bigg)}{\|h\|} = 0$

real-analysis multivariable-calculus

modified 4 hours ago Martin R 70.5k

0

votes

1

answer

41

views

Find the value of $\ a\ $ given that $\ y=4x+x^2-ax^3\ $ is concave for $\ x<3$

algebra-precalculus derivatives solution-verification convex-analysis

answered 4 hours ago max_zorn 3,955

0

votes

1

answer

60

views

How can i show that If ${a_n} \rightarrow a $ then $\{a_{n-1}\}_{n=2}$ converges to $a$

real-analysis limits

answered 5 hours ago phili0881 9

6

votes

0

answers

50

views

Reference request: Tiling the plane with congruent snowflakes

reference-request recreational-mathematics formal-languages symmetry tiling

modified 5 hours ago Ists Cilveks 61

2

votes

2

answers

45

views

Question about deciding the asymptotic distribution

probability statistics asymptotics gamma-distribution

answered 5 hours ago Stacker 8,125

2

votes

1

answer

86

views

+50

Conservation laws in the finite element method for domains with curved boundaries

partial-differential-equations numerical-methods finite-element-method galerkin-methods

modified 5 hours ago Ellya 11k

3

votes

0

answers

17

views

Skolem Hulls and countable elementary submodels of $H(\theta)$

set-theory

asked 5 hours ago Reveillark 11.4k

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