Mathematics Stack Exchange

0

votes

0

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5

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Transitive matrices

linear-algebra matrices graph-theory nonnegative-matrices

asked 3 mins ago user569423 15

0

votes

0

answers

5

views

Prove that $\text{aff}(X) = \text{aff}(\text{closure}(X))$

convex-analysis

asked 4 mins ago ted 1,187

0

votes

0

answers

5

views

Why the $(-1)^(pq)$ in tensor of cochain (whitney alexander map)?

algebraic-topology homology-cohomology homological-algebra tensor-products

asked 5 mins ago Andy 1,280

-1

votes

0

answers

13

views

Calculus Work Required

calculus integration word-problem

modified 5 mins ago Andrew Ostergaard 4,692

0

votes

0

answers

17

views

Consider the branch of the function $f(z)=\log(z^2+1)$ defined on the domain $C-\{x+iy:x=0, |y|\ge1\}$ so that $f(0)=0$. Compute…

complex-analysis complex-numbers

modified 6 mins ago Marco Esquandolas 195

0

votes

0

answers

8

views

Undergraduate real analysis book

real-analysis book-recommendation

asked 6 mins ago DJKG 27

0

votes

1

answer

10

views

A function that has continuity in its first variable but is not the second

calculus multivariable-calculus continuity partial-derivative

modified 6 mins ago Andrew Ostergaard 4,692

0

votes

0

answers

4

views

ADMM with non-convex objective function and constraints .. How to check convergence and optimality?

optimization nonlinear-optimization

asked 7 mins ago Math is fun 1

1

vote

2

answers

29

views

Is it true that $f(a+x)-f(x)$ is bounded for any $a$ if $f(x)$ is uniformly continuous on $\mathbb{R}$

real-analysis uniform-continuity

answered 8 mins ago Robert Wolfe 7,875

0

votes

1

answer

7

views

What does it mean for an equation to contain another equation within it?

linear-algebra statistics time-series

answered 8 mins ago Blue1.644934 23

0

votes

1

answer

13

views

Integrating Gaussian type integrand

gaussian-integral

answered 8 mins ago Claude Leibovici 152k

0

votes

0

answers

6

views

Congruence In a Field

ring-theory field-theory

asked 9 mins ago kepmhme 3

-1

votes

1

answer

11

views

Is the eigenvector associated to an eigenvalue for a matrix over the Complex numbers unique?

linear-algebra eigenvalues-eigenvectors

answered 9 mins ago Gae. S. 7,542

0

votes

0

answers

8

views

Is this $ \lim_{n\to \infty} [(n+1) (f(n+1)) - (n)(f(n)) ]$ reimann summable? Here, f(n) = $e^{{1 \over n} (\sum_{r=1}^{n}ln({r\over n}))} $

integration limits definite-integrals

modified 9 mins ago Hrishabh Nayal 55

0

votes

1

answer

18

views

Values of a and b in a power set

elementary-set-theory definition solution-verification

answered 14 mins ago Chris Custer 27k

0

votes

1

answer

19

views

Solving in $x$ the equation$ \frac{l}{d}=\frac{x}{\sin(x)}$

algebra-precalculus taylor-expansion approximation

modified 15 mins ago Andrew Ostergaard 4,692

0

votes

1

answer

8

views

A problem on Euclidean Geometry of of similarity of triangles, squares and angles

euclidean-geometry

modified 15 mins ago Thiago Alexandre 369

1

vote

1

answer

14

views

Converting marks to % when the lowest possible mark is not zero

arithmetic

modified 15 mins ago Andrew Ostergaard 4,692

0

votes

0

answers

5

views

What is the $p$-adic density of irreducible polynomials congruent to $g(x)^n$ modulo $p$?

number-theory irreducible-polynomials p-adic-number-theory hensels-lemma

modified 16 mins ago Ashvin Swaminathan 2,373

0

votes

0

answers

5

views

How to find the projection onto $R .(1,0)$?

convex-optimization

asked 18 mins ago Marjan 25

3

votes

4

answers

64

views

Help with Proof for Analysis Course

real-analysis proof-writing proof-explanation

modified 18 mins ago Carmeister 3,226

0

votes

1

answer

8

views

Multiplicative Inverse for Elements in an Integer Ring

elementary-number-theory modular-arithmetic inverse

modified 21 mins ago J. W. Tanner 32.8k

8

votes

0

answers

102

views

+50

On the simplification of $\Re\operatorname{Li}_5(1+i)$ and its generalization

calculus definite-integrals summation polylogarithm

modified 24 mins ago MHZ 2,833

0

votes

1

answer

11

views

Limit as $\alpha$ and $\beta$ tend to 1, indeterminate form

limits indeterminate-forms

modified 26 mins ago User19023 3

-2

votes

1

answer

12

views

Definition of orthogonality of polynomials, and derivative of a vector.

linear-algebra

answered 27 mins ago Thiago Alexandre 369

1

vote

1

answer

20

views

five integer sequences

sequences-and-series

answered 29 mins ago Gerry Myerson 159k

0

votes

1

answer

9

views

Q: Question about fields extensions.

field-theory extension-field

answered 31 mins ago Angina Seng 129k

0

votes

1

answer

16

views

What is the shortcut to convert hexadecimal to memory size?

binary

modified 37 mins ago Misha Lavrov 63.1k

0

votes

0

answers

6

views

Outer measure and g_delta set

outer-measure

modified 37 mins ago an4s 3,328

0

votes

0

answers

4

views

Issues for solving a linear partial differential equation of second order

pde partial-derivative initial-value-problems

asked 39 mins ago Abraham Hernández 5

0

votes

0

answers

22

views

Where does this asymptote for $H_n^{(k)}$ come from?

asymptotics harmonic-functions upper-lower-bounds harmonic-numbers

modified 40 mins ago Ali Shather 12.5k

2

votes

2

answers

30

views

What is the Area of the Circle given area of squares

geometry circles area

modified 47 mins ago Quanto 29.1k

0

votes

0

answers

24

views

Eliminate variables in maple

polynomials math-software maple expression-simplification

modified 48 mins ago Snow 1

1

vote

1

answer

23

views

Line Bundle with Everywhere Nonzero Section is Trivial

general-topology vector-bundles line-bundles

modified 49 mins ago Matematleta 20.4k

1

vote

1

answer

30

views

Continuity of first partial derivatives for a multivariable piecewise function

real-analysis

modified 52 mins ago Divide1918 413

0

votes

0

answers

21

views

Show that $\|T\|\leq 1$ when $\lim_{n\rightarrow \infty}\|T^{n}x\|=0$

functional-analysis operator-theory

asked 52 mins ago line 51

6

votes

1

answer

132

views

+200

Convergence in a generating algebra $\Rightarrow$ convergence in the weak* topology?

functional-analysis measure-theory ergodic-theory

modified 52 mins ago mathworker21 20.7k

-3

votes

0

answers

13

views

If (X,T) is a topological space, does every element of X have to be in T?

general-topology

asked 53 mins ago Jimmy Rankerman 133

0

votes

0

answers

6

views

How to solve a demonstration using orthogonal curvilinear coordinates

vector-analysis orthogonality cross-product divergence-operator curvilinear-coordinates

asked 58 mins ago ht1204 181

0

votes

1

answer

5

views

condition for nonexpansivity of a square matrix?

convex-optimization

answered 1 hour ago gt6989b 43.5k

0

votes

0

answers

5

views

Finding the condition so that length of a common tangent to an ellipse and another concentric ellipse is maximum

analytic-geometry conic-sections

asked 1 hour ago Paras Khosla 4,760

3

votes

1

answer

278

views

No Identity for Convolution

real-analysis convolution

modified 1 hour ago Andrew Ostergaard 4,692

0

votes

0

answers

11

views

Finding Potential Function of Sudoku Game (More of an algebraic/linear algebra manipulation question)

calculus linear-algebra matrices game-theory algorithmic-game-theory

asked 1 hour ago forreal 31

0

votes

0

answers

17

views

How to apply the operator in $\nabla \cdot (A \times B C)$?

ordinary-differential-equations vectors mathematical-physics cross-product divergence-operator

modified 1 hour ago Leucippus 21.7k

1

vote

1

answer

23

views

Visualizing projections in type $II_1$ AFD von Neumann algebras

hilbert-spaces operator-algebras von-neumann-algebras

modified 1 hour ago PStheman 351

0

votes

0

answers

17

views

Can the Borel sets be recovered from the Lebesgue sets and the null sets?

general-topology measure-theory

modified 1 hour ago Ghwosque 185

0

votes

0

answers

20

views

Coarsest topology such that addition and multiplication are continuous

general-topology continuity

modified 1 hour ago sedrick 948

-1

votes

0

answers

10

views

Help with two variable inequality

inequality

modified 1 hour ago Andrew Ostergaard 4,692

0

votes

0

answers

13

views

Law of the Unconscious Statistician Notation

probability analysis measure-theory expected-value

asked 1 hour ago alpha_beta_gamma 15

0

votes

0

answers

9

views

On stability of time delayed systems in Laplace form

linear-algebra laplace-transform stability-theory linear-control delay-differential-equations

modified 1 hour ago Amir Amini 67

0

votes

0

answers

13

views

Definition of height of ideal

algebraic-geometry commutative-algebra

asked 1 hour ago ykk 1

0

votes

0

answers

6

views

The series expression of Green's function.

pde fourier-series poissons-equation

modified 1 hour ago Cloud 43

1

vote

2

answers

58

views

A change of variable for $\int_0^1 \frac{n^{4/3}x}{1+n^{5/2}x^3} \ dx$

integration analysis lebesgue-integral

answered 1 hour ago alex.jordan 45k

0

votes

0

answers

6

views

Prove that the number of fixed points in σ is equal to the number of columns having odd length in P

symmetric-groups

asked 1 hour ago user520403 397

0

votes

0

answers

19

views

Bounds on norms of difference of fractions

real-analysis functional-analysis analysis normed-spaces

modified 1 hour ago lucaszz 13

0

votes

1

answer

13

views

Derivative of maximum function coinciding at a maximal point

real-analysis calculus analysis

answered 1 hour ago copper.hat 141k

0

votes

1

answer

11

views

Breaking a hypergraph into two hypergraphs of smaller degree

combinatorics hypergraphs

answered 1 hour ago bof 58.6k

0

votes

1

answer

13

views

Discard the existence of a 720-cell as a regular 4-polytope

geometry polytopes

answered 1 hour ago David K 66.3k

0

votes

1

answer

14

views

Why do we have to assume continuity and differentiability when proving geodesics?

geometry geodesic

answered 1 hour ago Andreas Blass 55.7k

0

votes

0

answers

8

views

Estimating error under Taylor expansion of denominator

functions taylor-expansion fractions error-propagation

asked 2 hours ago user1936752 1,000

-1

votes

0

answers

6

views

Phase factors in SHO (Qunatum Mechanics)

quantum-mechanics

asked 2 hours ago charlie 1

-1

votes

0

answers

11

views

construction of a counter example of inclusion of lower limits

probability-theory limsup-and-liminf

asked 2 hours ago Yeferson Gomez 1

0

votes

3

answers

24

views

Question based on first digit of $2^m$ in base $3$.

elementary-number-theory

answered 2 hours ago fleablood 93.2k

0

votes

1

answer

17

views

what is the laurent expansion of this function

complex-analysis laurent-series

answered 2 hours ago zugzug 1,969

0

votes

0

answers

9

views

Relation between Pontryagin classes and Chern classes, confusion with proof

differential-geometry algebraic-topology characteristic-classes

asked 2 hours ago samlanader 583

0

votes

0

answers

8

views

Integral of Gaussian CDF times PDF

probability integration normal-distribution

asked 2 hours ago MeowBlingBling 349

0

votes

1

answer

26

views

Proof question about the definition of the integral via Darboux sums

real-analysis proof-explanation solution-verification riemann-sum

modified 2 hours ago Rob Pratt 10.1k

1

vote

1

answer

12

views

Deriving network modularity

graph-theory network

answered 2 hours ago Yly 10.4k

0

votes

1

answer

14

views

converting an A xor B xor C to conjunctive normal form (CNF) using equivalencies.

discrete-mathematics conjunctive-normal-form

modified 2 hours ago Rob Pratt 10.1k

0

votes

0

answers

13

views

Convergence of $ \int\limits_0^1{\frac{\sqrt[m]{\ln ^2\left( 1-x \right)}}{\sqrt[n]{x}}} dx$

calculus integration

modified 2 hours ago David G. Stork 18.8k

1

vote

0

answers

8

views

matrix psd inequalities

matrices inequality

asked 2 hours ago Zhao Song 61

-1

votes

0

answers

12

views

How far are we to prove that the Euler-Mascheroni Constant $\gamma$ is irrational?

number-theory irrational-numbers transcendental-numbers eulers-constant open-problem

asked 2 hours ago user765118 1

1

vote

1

answer

12

views

Approximating continuous positive functions

polynomials approximation

modified 2 hours ago Asker 13

3

votes

0

answers

20

views

Question about equivalent metrics and complete metrics

real-analysis metric-spaces cauchy-sequences

modified 2 hours ago bzoll213 133

0

votes

0

answers

6

views

Find minima for the KL divergence

real-analysis probability statistics information-theory coding-theory

asked 2 hours ago sn3jd3r 387

5

votes

1

answer

265

views

+100

Fixed points of simplicial maps

general-topology algebraic-topology simplicial-complex

answered 2 hours ago Igor Ernst 56

1

vote

1

answer

31

views

Interval of convergence of $\sum_{n=1}^{\infty}\frac{n^{n}x^{n}}{e^{n}(n+2)!}$

sequences-and-series

answered 2 hours ago Simply Beautiful Art 64.6k

1

vote

1

answer

29

views

Prove that $\displaystyle\lim_{n\rightarrow\infty}\sqrt[n]{a_n}=L$

real-analysis sequences-and-series limits

answered 2 hours ago John Omielan 24.4k

2

votes

0

answers

11

views

Derivatives of a meromorphic function determined by principal part of Laurent series at singularities

complex-analysis

modified 2 hours ago Chappers 61k

0

votes

0

answers

11

views

Armijo Line-Search Rule

real-analysis optimization convex-analysis convex-optimization nonlinear-optimization

modified 2 hours ago user763178 33

0

votes

0

answers

4

views

Global linear rate of Newton’s method with Armijo’s line search rule

real-analysis optimization convex-analysis convex-optimization nonlinear-optimization

asked 2 hours ago user763178 33

1

vote

0

answers

16

views

Is $\prod (x - (\sqrt[p]{2}\zeta_{p}^s + \sqrt[q]{3}\zeta_{q}^r) )$ a polynomial with rational coefficients, p, q prime?

abstract-algebra ring-theory field-theory galois-theory minimal-polynomials

modified 2 hours ago Teh Rod 2,752

3

votes

0

answers

23

views

Equality in trace duality

real-analysis linear-algebra matrices duality-theorems matrix-analysis

modified 2 hours ago RLC 481

0

votes

0

answers

12

views

A help in exact sequence and Castelnuovo-Mumford regularity

algebraic-geometry sheaf-theory sheaf-cohomology

asked 2 hours ago Allain JF 442

4

votes

0

answers

41

views

A Gronwall-type inequality for $L^p$ norms

real-analysis analysis inequality pde

modified 2 hours ago Feng Shao 6,491

0

votes

0

answers

9

views

Bounding the singularity of integrals

real-analysis pde

asked 2 hours ago Nick 61

0

votes

0

answers

8

views

Find steady state probability of system

queueing-theory steady-state

asked 2 hours ago bilbo 229

0

votes

0

answers

10

views

About Nonlinear System of Differential Equations

ordinary-differential-equations numerical-methods systems-of-equations

asked 3 hours ago Victor F Salazar G 1,175

0

votes

0

answers

11

views

How to do calculus of variations when the functional is not a simple integral?

optimization functional-equations calculus-of-variations euler-lagrange-equation

modified 3 hours ago David G. Stork 18.8k

0

votes

0

answers

5

views

space of representation surface group and the moduli space

differential-geometry manifolds surfaces manifolds-with-boundary moduli-space

asked 3 hours ago Zineb mazouzi 1

2

votes

1

answer

20

views

Set Theory Foundations book recommendation (meta-math)

reference-request set-theory book-recommendation foundations

modified 3 hours ago J. W. Tanner 32.8k

3

votes

3

answers

25

views

inital value problem, Linear algebra

calculus linear-algebra initial-value-problems

answered 3 hours ago Robert Lewis 58.5k

1

vote

1

answer

87

views

Rotation matrix describing a Local Coordinate Sytem within a Global Coordinate System

linear-algebra trigonometry

modified 4 hours ago Je2b 11

0

votes

1

answer

17

views

Disproving Multivariable Limit

limits multivariable-calculus

modified 4 hours ago Andrew Ostergaard 4,692

0

votes

1

answer

33

views

Solving Quadratic Programming Problem using Linear Programming Solver

optimization linear-programming numerical-optimization quadratic-programming simplex-method

modified 4 hours ago Royi 5,306

0

votes

0

answers

38

views

$\iiint_D (x^2+y^2+z^2) \; dx dy dz$ where $D = \{(x,y,z) \in \mathbb{R}^3 \,|\, x^2+y^2+z^2 \leq 1, \, x^2+y^2 \leq z^2, \, z \geq 0 \}$

calculus integration definite-integrals volume spherical-coordinates

modified 4 hours ago Arturo Magidin 295k

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