Mathematics Stack Exchange

0

votes

0

answers

13

views

Find all combinations that sum up to a specific number With Given Constrains

combinatorics permutations combinations programming

modified 1 min ago VibeeshanRC 108

0

votes

1

answer

9

views

Inequality of cauchy

calculus algebra-precalculus inequality

answered 1 min ago Jakobian 2,149

0

votes

0

answers

8

views

Possible solutions of some system of equations

linear-algebra systems-of-equations

modified 1 min ago 5xum 85.4k

2

votes

1

answer

27

views

Show that $f_a(z)=z+a-e^z$ has only 1 zero in $Re(z)<0$ and this zero is $<0$. $(a>1)$

complex-analysis roots rouches-theorem

modified 2 mins ago Martin R 24.6k

0

votes

0

answers

3

views

Modified conjugate gradient methods for densely optimized calculations?

linear-algebra reference-request numerical-methods soft-question computational-mathematics

asked 2 mins ago mathreadler 14.1k

2

votes

1

answer

41

views

What can I say of x given these conditions?

number-theory

modified 5 mins ago Dietrich Burde 75.8k

0

votes

1

answer

26

views

Is there a standard notation for an ordinal number with cardinality of the continuum?

notation cardinals ordinals

modified 5 mins ago MJD 46.4k

0

votes

0

answers

10

views

About roots of unity in an arbitrary CM field K with an abelian extension L

abstract-algebra extension-field roots-of-unity

modified 5 mins ago Oslap 1

1

vote

1

answer

20

views

Show some property of a Markov process

probability-theory stochastic-processes conditional-expectation markov-process

modified 6 mins ago saz 74.8k

0

votes

0

answers

7

views

Simulate a discrete random variable

random-variables random simulation

modified 7 mins ago drhab 91.2k

0

votes

3

answers

24

views

Prove that $B_{0}=\{x\in (0, 1) \mid x=m/2^{n} \;\text{for some} \; m\in\mathbb{N} \;\text{and}\; n\in\mathbb{N}\}$ is countable.

real-analysis

answered 8 mins ago Peter Szilas 9,216

2

votes

0

answers

32

views

Verify the proof about field extension.

abstract-algebra field-theory extension-field

modified 8 mins ago MJD 46.4k

0

votes

1

answer

15

views

Monic polynomial with coefficients in $\mathbb F_2$ whose companion matrix is invertible and has largest possible multiplicative order

linear-algebra matrices group-theory commutative-algebra irreducible-polynomials

modified 9 mins ago Andreas Caranti 55.3k

1

vote

1

answer

21

views

The difference between implication and consequence.

discrete-mathematics propositional-calculus

answered 10 mins ago Wuestenfux 1,707

-1

votes

0

answers

10

views

What is the domain of $\arccos(2x/(1+x))$?

real-analysis real-numbers

modified 11 mins ago Brahadeesh 4,964

0

votes

0

answers

6

views

A problem involving intermediate value

real-analysis functions

asked 13 mins ago fantasie 107

1

vote

0

answers

72

views

Conditional expectation of random sums

probability conditional-expectation

modified 15 mins ago martin_galo 19

0

votes

0

answers

9

views

Surface integral with flat triangle surface

calculus

modified 17 mins ago Gerry Myerson 144k

1

vote

0

answers

17

views

counterexamples with complex function

functions examples-counterexamples

modified 20 mins ago inequality 887

0

votes

1

answer

16

views

How do you solve for lambda in an exponential distribution?

probability probability-distributions exponential-distribution quantile

answered 21 mins ago Stockfish 76

0

votes

0

answers

10

views

Integration by parts for stochastic equations?

stochastic-processes stochastic-analysis

modified 26 mins ago Carl S 54

1

vote

0

answers

21

views

Is it possible to prove the following inequality?

real-analysis inequality convex-analysis

asked 27 mins ago Frank Moses 1,144

0

votes

1

answer

21

views

Defining a set which contains one element per element in another set

general-topology elementary-set-theory notation

answered 27 mins ago drhab 91.2k

0

votes

1

answer

41

views

Finding an analytical solution to a simple 2D Finite Element Method problem

multivariable-calculus finite-element-method

modified 27 mins ago Ryan Howe 1,907

1

vote

0

answers

5

views

Interpolation inequality on $L^p$ space

functional-analysis analysis pde sobolev-spaces

asked 29 mins ago Pan 43

1

vote

0

answers

4

views

Orthonormal basis for Sobolev Space $H^1[0,1]$ in one dimension

functional-analysis hilbert-spaces sobolev-spaces

asked 29 mins ago sranthrop 6,837

1

vote

0

answers

11

views

Continuity of symmetric multilinear maps

functional-analysis analysis multilinear-algebra

modified 35 mins ago Masacroso 11.7k

5

votes

1

answer

157

views

What is the smallest prime factor of the number $14^{14^{14}}+13\ $?

number-theory divisibility prime-factorization big-numbers

modified 39 mins ago Martin Hopf 81

1

vote

1

answer

17

views

Projection on closed convex set

functional-analysis

answered 40 mins ago daw 22.8k

0

votes

0

answers

8

views

Prove that this integral with exponent with whole part is convergent

real-analysis integration polar-coordinates

asked 41 mins ago C. Bishop 11

0

votes

1

answer

12

views

Some results about higher direct image

algebraic-geometry

modified 41 mins ago Intoks Liobein 401

0

votes

0

answers

14

views

Simpson vs. trapezoidal rule for numerically integrating cos(x)*cosh(x) in range 0 to pi?

integration numerical-methods fourier-series trigonometric-series simpsons-rule

modified 45 mins ago dani_bagh 1

2

votes

2

answers

18

views

How can I simplify the derivative further to match the correct answer?

calculus

answered 46 mins ago farruhota 16.3k

2

votes

1

answer

28

views

Proving Euler-Fermat's Theorem

elementary-number-theory totient-function

modified 49 mins ago Moed Pol Bollo 348

1

vote

0

answers

13

views

Differential expression in Fourier's paper “Theory of Heat”

calculus differential-equations heat-equation

asked 50 mins ago Vaggelis Kyrilas 11

0

votes

0

answers

9

views

Compositeness tests for numbers of the form $k \cdot b^n \pm c$

elementary-number-theory prime-numbers examples-counterexamples primality-test

asked 52 mins ago Peđa Terzić 8,016

2

votes

2

answers

15

views

If $r$ is a nilpotent element of a commutative ring $R$ then $(r)$ is not a direct summand of $R$ as an $R$-module.

ring-theory modules

modified 58 mins ago Fabio Lucchini 7,000

1

vote

1

answer

36

views

On the probability of placing cups on saucers

probability combinatorics inclusion-exclusion

modified 59 mins ago utobi 132

1

vote

0

answers

15

views

Connected Lie group 1-dimensional isomorphic to $\mathbb{R}$ or to $S^1$

abstract-algebra exponential-function lie-groups lie-algebras

asked 1 hour ago userr777 195

0

votes

0

answers

12

views

Behaviour of matrix multiplication under dimensionality reduction.

geometry differential-geometry

asked 1 hour ago John Smith 39

0

votes

0

answers

7

views

Composition factors above a subnormal subgroup

abstract-algebra group-theory

asked 1 hour ago Alan Wang 4,761

0

votes

0

answers

16

views

Prove that this $ \sup $ is finite

real-analysis infinity supremum-and-infimum

asked 1 hour ago C. Bishop 11

3

votes

0

answers

42

views

Exponent of the group $GL(n,\mathbb F_2)$

linear-algebra matrices group-theory finite-groups group-actions

modified 1 hour ago user521337 311

1

vote

2

answers

21

views

Project line onto a circle

trigonometry circle

modified 1 hour ago koalo 43

0

votes

0

answers

8

views

Evolution for discrete dynamical system

dynamical-systems

modified 1 hour ago user7534 1

0

votes

1

answer

20

views

Finding $P_{B\leftarrow C}$ and $P_{C\leftarrow B}$ geometrically

linear-algebra vector-spaces change-of-basis

modified 1 hour ago Dominic Hicks 52

2

votes

2

answers

22

views

Injection from cardinal $\lambda$ to cardinal $\kappa$ implies $\lambda\leq\kappa$

set-theory cardinals ordinals

answered 1 hour ago Asaf Karagila♦ 297k

0

votes

0

answers

14

views

+50

Solving 2-dimensional recurrence matrix of homogenous polynomials

polynomials recurrence-relations

modified 1 hour ago PierreTheFermented 1,089

2

votes

0

answers

38

views

Ideal $I$ in a Noetherian ring such that $I+(b)$ and $I+(a)$ are projective, where $ab\in I$

commutative-algebra modules ideals projective-module

modified 1 hour ago Souvik Dey 4,017

2

votes

0

answers

27

views

Problem with a Hypergeometric function integral

integration complex-analysis hypergeometric-function

modified 1 hour ago A.Dunder 18

2

votes

2

answers

24

views

Special solution to $a+e^a\ln x = x+e^a\ln a = a+e^x\ln a$

closed-form nonlinear-system lambert-w transcendental-equations

modified 1 hour ago Claude Leibovici 114k

1

vote

0

answers

33

views

+50

Help factorising this matrix series

linear-algebra matrices factoring

modified 1 hour ago Xiaomi 730

1

vote

0

answers

17

views

Prove there are infinitely many positive whole numbers that are NOT of the form $4xy+3x+y$ or $4xy+3x-y$

number-theory elementary-number-theory

modified 1 hour ago Tilsight 6

0

votes

0

answers

10

views

Given a positive sequence $\{a_n\}$ where $a_{n+1}=a_n+\frac{n}{a_n}$, can one find an asymptotic expansion of $a_n-n$?

calculus

modified 1 hour ago Blue 45.1k

1

vote

2

answers

33

views

characterization of the existence of higher order expectation.

probability probability-theory expected-value

modified 1 hour ago saz 74.8k

1

vote

1

answer

18

views

How do I remove $y$ from $xy$ in $y=xy-2x$?

inverse-function

modified 1 hour ago Blue 45.1k

0

votes

0

answers

6

views

How to integrate$\int_0^{t} xe^{i(ax^2)}J_0(bx)\,\mathrm dx$?

calculus integration

asked 1 hour ago ted930511 21

1

vote

1

answer

9

views

Smooth vector bundles continuously isomorphic are smoothly isomorphic

differential-topology vector-bundles

answered 1 hour ago Thomas Rot 6,705

1

vote

1

answer

13

views

Finding the dual of a linear programming problem

linear-programming

modified 1 hour ago Siong Thye Goh 86.4k

1

vote

0

answers

31

views

Verification of Limit Proof for $\lim_{x \to 9} \sqrt{x-5} = 2$

calculus proof-verification epsilon-delta

modified 1 hour ago Danielle 6

0

votes

0

answers

12

views

Finding factors s.t. f(x) > g(x)

real-analysis functions elementary-functions

modified 1 hour ago daw 22.8k

0

votes

0

answers

23

views

Is Piecewise linear function necessarily convex?

optimization vector-spaces convex-analysis

modified 1 hour ago daw 22.8k

0

votes

0

answers

12

views

Prove the product of two distinct integrable functions is integrable.

real-analysis riemann-integration partitions-for-integration

asked 1 hour ago gaj 31

1

vote

1

answer

24

views

How to calculate $H_n(\ast)$?

algebraic-topology homology-cohomology

answered 1 hour ago Aloizio Macedo♦ 23k

0

votes

0

answers

12

views

Sequence converges iff function is continuous on extension of natural numbers (topology)

general-topology

modified 1 hour ago The math god 122

0

votes

0

answers

20

views

The $\heartsuit$ operator on $\mathcal{L}^2(SL_2(\mathbb{Z})\backslash \mathbb{H})$

analytic-number-theory modular-forms l-functions

asked 1 hour ago pks 159

4

votes

2

answers

57

views

Differentials in Multivariable Calculus

multivariable-calculus partial-derivative vector-analysis intuition differential

modified 2 hours ago Markus Scheuer 57.6k

0

votes

0

answers

18

views

Question on matrix representation of equations

linear-algebra matrices matrix-equations matrix-calculus computational-mathematics

modified 2 hours ago SlightlyDeviant 42

0

votes

1

answer

18

views

What would a rigorous proof that the vector space of functions from $\mathbb{Z}$ to $\mathbb{R}$ is not finite-dimensional look like?

functions vector-spaces proof-writing

answered 2 hours ago trancelocation 6,601

0

votes

0

answers

13

views

Relation of $f : V \rightarrow V$ and $Id_v$

linear-algebra matrices linear-transformations

asked 2 hours ago big daddy 22

0

votes

0

answers

15

views

Quantity of same numbers in same positions of permutations and it's resort

combinatorics permutations sorting

modified 2 hours ago user514787 626

1

vote

0

answers

7

views

Basis for vector space of functions from integers to reals subject to averaging condition.

linear-algebra algebra-precalculus vector-spaces

asked 2 hours ago user604365 6

0

votes

0

answers

12

views

Change of variable in double integrals.

calculus multivariable-calculus

asked 2 hours ago blue boy 1,175

1

vote

0

answers

12

views

Differential equation on $S^{1}$?

differential-equations dynamical-systems fixedpoints

asked 2 hours ago BAYMAX 2,737

0

votes

0

answers

24

views

Linear algebra rref uniqueness proof exaplanation

linear-algebra matrices systems-of-equations proof-explanation

modified 2 hours ago eemakarena 1

10

votes

1

answer

163

views

Separation Properties in Topology

general-topology metric-spaces

modified 2 hours ago Henno Brandsma 97.1k

0

votes

0

answers

11

views

Every well-ordered set is isomorphic to a unique ordinal number

proof-verification ordinals

modified 2 hours ago Akira 250

0

votes

0

answers

8

views

if f is $\alpha$ -strong convex ,then $\mathbb{E}_{v \sim\mathbb{B}(0,1)}[f(x+ \delta v)]$ is $\alpha$ -strong convex

probability optimization convex-optimization

asked 2 hours ago ShaoyuPei 118

1

vote

0

answers

17

views

Show that the product of the Jacobian and the inverse Jacobian is 1

linear-algebra multivariable-calculus jacobian

asked 3 hours ago Andrew Chen 6

0

votes

0

answers

12

views

Monthly change formula logic.

economics

asked 3 hours ago Josef Klimuk 121

0

votes

0

answers

9

views

Conditions to tell that the total flux in a vector field across a closed surface is zero

calculus multivariable-calculus vector-analysis surface-integrals line-integrals

asked 3 hours ago Waleed Bin Khalid 1

1

vote

1

answer

15

views

Prove the extension of Lusin's Theorem

measure-theory lebesgue-measure

answered 3 hours ago Kavi Rama Murthy 31.1k

0

votes

2

answers

161

views

How to verify this isomorphism?

linear-algebra

modified 3 hours ago Legoman 4,838

1

vote

0

answers

11

views

Differentiability of representation of a matrix Lie group

representation-theory lie-groups

modified 3 hours ago dani 229

0

votes

2

answers

15

views

Intersection of sequence of compact non empty sets has a similar diameter to the elements in the sequence?

real-analysis general-topology

modified 3 hours ago quasi 34.5k

0

votes

0

answers

7

views

Prove existence of dominant trading strategy

finance

asked 3 hours ago dunguyen 31

0

votes

1

answer

18

views

Equation for the expected value of a discrete random variable

probability-theory random-variables expected-value

answered 3 hours ago grand_chat 18.8k

1

vote

1

answer

31

views

Can the set of odd primes be decomposed into $\Bbb{P} = A + B, $ for some $A,B \subset \Bbb{Z}$?

elementary-number-theory prime-numbers integers semigroups additive-combinatorics

answered 3 hours ago Ross Millikan 284k

1

vote

0

answers

9

views

Prove the rank of the matrix ${\bf B}=\left[ \left({{\bf HH}^H}\right) \left({{\bf HH}^H}\right)^+ - {\bf I} \right]$ is $\left( N-M \right)$.

linear-algebra

asked 3 hours ago Ang Li 16

8

votes

0

answers

37

views

Exponentiation and a weak fragment of arithmetic

logic model-theory nonstandard-models

modified 3 hours ago Noah Schweber 115k

2

votes

0

answers

19

views

Points of Confusion About Second-Order Taylor Formula of Taylor's Theorem For Many Variables

real-analysis integration multivariable-calculus inequality taylor-expansion

modified 4 hours ago The Pointer 2,733

1

vote

0

answers

11

views

Given specific of an iterative code prove it with program correctness

algorithms

asked 4 hours ago Tree Garen 115

1

vote

1

answer

38

views

Re: Stewart & Tall, “Complex Analysis” ($2^\text{nd}$ ed. 2018), Proposition 2.45: constructing a family of space-filling curves

real-analysis general-topology complex-analysis proof-verification curves

modified 4 hours ago Calum Gilhooley 3,202

1

vote

0

answers

8

views

Prove that for any odd number m, there is some $e \in \mathcal{E}$ such that $vr(e) + op(e) = m$

induction

asked 4 hours ago Tree Garen 115

0

votes

1

answer

13

views

Question about proof of Heine-Cantor (i.e. compact and continuous implies uniform continuous)

real-analysis general-topology

modified 4 hours ago Henno Brandsma 97.1k

0

votes

3

answers

87

views

Finding minimum value of $\sqrt{x^2-2x+1} + \sqrt{x^2-6x+13}$

real-analysis optimization quadratics radicals maxima-minima

modified 4 hours ago Michael Rozenberg 91.7k

Explore Our Questions