Mathematics Stack Exchange

0

votes

0

answers

16

views

Distance Euler's Line

geometry

modified 1 min ago peta arantes 64

0

votes

0

answers

3

views

Is $\Bbb P^n_k$ irreducible?

general-topology algebraic-geometry

asked 1 min ago Bryan Shih 3,215

0

votes

0

answers

4

views

$\mathbb Z_3\rtimes Q_8$ is isomorphic to Dicyclic group of order $24$

abstract-algebra group-theory finite-groups

asked 2 mins ago Andrews 1,436

0

votes

0

answers

3

views

Projection onto Product of Two Constraint Sets

linear-algebra nonlinear-optimization projection

asked 3 mins ago SOSalytics 1

0

votes

0

answers

6

views

Divergent complex sequence

sequences-and-series complex-analysis analysis

asked 3 mins ago Mattia_Borriello 1

0

votes

0

answers

5

views

Mean of Noise Data

probability-distributions means

modified 3 mins ago MLLearner 1

5

votes

1

answer

44

views

Problem from the shortlist of the Romanian Mathematical olympiad

linear-algebra matrices contest-math

modified 4 mins ago Rob Pratt 3,244

0

votes

1

answer

22

views

$\inf$ and $\sup$ of two real random variables

probability random-variables random borel-sets

answered 7 mins ago grand_chat 22.2k

0

votes

0

answers

5

views

Is the set of wffs Γ = {¬Ry | y ∈ V } ∪ {∃x Rx} satisfiable?

first-order-logic

asked 8 mins ago Steve 1

0

votes

0

answers

7

views

Question about linear algebra in Benson's book “Representations theory of elementary abelian groups and vector budles”

linear-algebra abstract-algebra algebraic-geometry field-theory representation-theory

modified 11 mins ago Sky 1,406

1

vote

0

answers

4

views

transition denity of Brownian motion with drift

probability stochastic-processes heat-equation

asked 12 mins ago L.Chen 6

0

votes

0

answers

15

views

What does “L^2(W)” mean?

hilbert-spaces

asked 12 mins ago Marwa 6

2

votes

1

answer

780

views

Euclid: The Game - Level 23: Construct an external common tangent to two given circles in five moves?

geometry euclidean-geometry

modified 13 mins ago Community♦ 1

1

vote

1

answer

29

views

+300

Limit of Buchstab function

limits prime-numbers

answered 15 mins ago mathworker21 15.5k

0

votes

0

answers

11

views

Primitive sets $\bmod n$

number-theory primitive-roots

modified 23 mins ago Arturo Magidin 281k

0

votes

1

answer

18

views

I want to prove that the set below is a topological base.

general-topology

modified 24 mins ago Juan Diego Rojas 197

1

vote

1

answer

22

views

construction of a chord that is trisected by a point

euclidean-geometry

modified 25 mins ago Oscar Lanzi 15.9k

0

votes

1

answer

16

views

Are smooth and vanishing functions square integrable?

integration functional-analysis smooth-functions

answered 26 mins ago Kabo Murphy 133k

2

votes

0

answers

16

views

Prove that $x \mapsto (f_1 (x), \ldots, f_m(x))$ is differentiable at $x$

real-analysis multivariable-calculus derivatives

asked 27 mins ago MadnessFor MATH 2,499

0

votes

0

answers

8

views

Calculate face of a figure bounded by a curve

python

asked 29 mins ago nop 101

0

votes

0

answers

15

views

Expectation of Infinite Sum of Indicator Functions

probability limits probability-theory measure-theory expected-value

modified 30 mins ago mexmex 153

-1

votes

1

answer

18

views

Find the probability that gcd(a,b) not equal to 1

probability

answered 30 mins ago Fede1 146

0

votes

0

answers

13

views

Range of Marginal Probability Distibution

probability integration limits statistics marginal-distribution

modified 33 mins ago Math1000 21.2k

0

votes

0

answers

10

views

A few questions on computation of Divisor class groups

abstract-algebra algebraic-geometry commutative-algebra

modified 35 mins ago user45765 3,606

2

votes

1

answer

13

views

Is it possible to determine the given matrix is positive semidefinite under these conditions?

linear-algebra positive-semidefinite

modified 36 mins ago Martin Argerami 136k

0

votes

1

answer

21

views

Compact operator from $l_2$ to $l_1$

functional-analysis

answered 36 mins ago Kabo Murphy 133k

-1

votes

0

answers

16

views

Can the powers of the adjacency matrix $A$ of $G (A;A^2;A^3;…)$ have some entry equal to $0$?

combinatorics discrete-mathematics graph-theory

modified 38 mins ago Manx 1,552

-1

votes

0

answers

13

views

Find n-th convergent of continued fraction

convergence continued-fractions pell-type-equations

modified 40 mins ago A.Tressos 1

0

votes

1

answer

9

views

Checking a newtonian binomial expansion

algebra-precalculus binomial-coefficients binomial-theorem

answered 41 mins ago A. Goodier 4,821

1

vote

2

answers

35

views

The maverick nature of the sum of squares proof

algebra-precalculus proof-explanation sums-of-squares

modified 42 mins ago Andrés E. Caicedo 67.8k

0

votes

0

answers

11

views

Longest Path in a grid graph

graph-theory

asked 45 mins ago Bob_Bobb 87

0

votes

1

answer

43

views

Expected value of a lottery ticket bundle

probability expected-value

modified 46 mins ago Arjen de Schipper 26

0

votes

1

answer

18

views

How many strings are possible?

combinatorics permutations

answered 49 mins ago WindSoul 97

-1

votes

0

answers

18

views

an ODE system that i have never senn again neither i have learned a way to solve it

ordinary-differential-equations

modified 50 mins ago user485528 1

0

votes

1

answer

31

views

Compact spaces by sequences - Topology

sequences-and-series general-topology compactness

modified 50 mins ago Eric Wofsey 218k

1

vote

0

answers

23

views

A converse version of Fubini's Theorem

integration measure-theory product-space fubini

modified 50 mins ago Mahdi Haghifam 98

0

votes

1

answer

21

views

$T[f](t) = \frac{1}{t} \cdot \int_{0}^{t} f(s)ds$ is continuous and injective but not surjective

real-analysis

answered 54 mins ago Kabo Murphy 133k

3

votes

0

answers

40

views

Devise strategy to hit submarine

real-analysis sequences-and-series

modified 1 hour ago M. Nestor 1,302

1

vote

1

answer

28

views

Asymptotic distribution of a Maximum Likelihood Estimator using the Central Limit Theorem

statistics statistical-inference central-limit-theorem maximum-likelihood parameter-estimation

modified 1 hour ago lucia de finetti 70

2

votes

2

answers

29

views

Continued fraction expansion of $\sqrt{d^2+1}$

number-theory quadratic-forms

modified 1 hour ago Milten 1,256

1

vote

1

answer

21

views

Find all critical values of $f(x,y,z)=(2x+4y-3z)^2$ And find all $c$ such that $f(x,y,z)=c$ is regular

multivariable-calculus differential-geometry differential-topology

answered 1 hour ago C. Ekinci 112

0

votes

1

answer

7

views

sub-family of cover with compact closure is still a cover?

smooth-manifolds

answered 1 hour ago Jack Lee 30.6k

1

vote

1

answer

33

views

Explaining a picture on pg.5 in AT.

general-topology algebraic-topology surfaces cw-complexes

answered 1 hour ago Noah Caplinger 8

0

votes

1

answer

11

views

Reasoning for this particular orbit

abstract-algebra group-theory dihedral-groups

modified 1 hour ago Klaas van Aarsen 4,427

1

vote

1

answer

20

views

Exponential of Kronecker product

linear-algebra matrix-exponential kronecker-product

modified 1 hour ago Omnomnomnom 137k

1

vote

1

answer

21

views

Prove that the following limit equals $f''(a)$ if $f''(a)$ exists

calculus limits derivatives

modified 1 hour ago Fred Jefferson 178

0

votes

1

answer

21

views

Maple simplify a polynomial without using functions that uses gcd.

polynomials gcd-and-lcm maple computer-algebra-systems multivariate-polynomial

answered 1 hour ago Jacques Carette 620

0

votes

0

answers

3

views

Hypergeometric Hypothesis Testing

statistics statistical-inference hypothesis-testing

asked 1 hour ago Prince M 2,222

0

votes

1

answer

12

views

coordinate-wise multiplication

matrices

answered 1 hour ago Ross Millikan 318k

0

votes

0

answers

17

views

Draw balls from urn - check my proof

probability combinatorics proof-verification combinations

modified 1 hour ago Philipp 339

0

votes

1

answer

17

views

Convergence Locally in Uniform Convergence

real-analysis uniform-convergence analytic-number-theory

modified 1 hour ago RRL 60.3k

1

vote

0

answers

16

views

Strategies for translating statements into formal logic language

logic proof-explanation first-order-logic predicate-logic higher-order-logic

modified 1 hour ago Manx 1,552

0

votes

0

answers

4

views

Formulate Least Squares problem with fixed subset of x

least-squares

asked 1 hour ago Valeria 25

-1

votes

0

answers

15

views

Prove that $\mathbb{R}=\sqcup_{i\in \mathfrak{c}}A_i, \mu^*(A_i)>0$

measure-theory set-partition outer-measure

asked 1 hour ago Anton Kulikov 44

0

votes

0

answers

7

views

Taking the derivative of a constraint equation

derivatives partial-derivative fake-proofs

modified 1 hour ago Alexandre H. Tremblay 492

1

vote

8

answers

110

views

Prove that $n^3+2$ is not divisible by $4$

discrete-mathematics

modified 1 hour ago user 104k

0

votes

0

answers

6

views

Find factor of cubic polynomial with fraction as dominant coefficient

polynomials roots factoring cubic-equations

asked 1 hour ago Mark Samuel 7

3

votes

1

answer

54

views

$(z-1)^5 = z^5$ for complex $z$

complex-analysis

modified 1 hour ago The Pointer 2,339

0

votes

1

answer

6

views

Convexity of softmax logistic regression

calculus linear-algebra convex-analysis convex-optimization machine-learning

answered 1 hour ago LinAlg 11.2k

0

votes

0

answers

7

views

Horocycle in HAA space

euclidean-geometry

asked 1 hour ago HK Lee 15.4k

0

votes

0

answers

9

views

Sheaf of regular function on projective curve

algebraic-geometry sheaf-theory

asked 1 hour ago Desunkid 179

0

votes

0

answers

9

views

Perfect Grasshopper Tour

sequences-and-series combinatorics elementary-number-theory modular-arithmetic

asked 2 hours ago Vepir 4,073

0

votes

0

answers

23

views

+50

Analytic non-zero eigenvalues of two-parameter (periodic) family of positive semi-definite hermitian matrices

real-analysis linear-algebra complex-analysis perturbation-theory positive-semidefinite

modified 2 hours ago Dominic Reiss 56

0

votes

0

answers

9

views

The Floer Equation is Elliptic

pde terminology

asked 2 hours ago TheGeekGreek 5,230

1

vote

1

answer

10

views

Let $X$ be an element in $\mathbb{E}(A,B)$, and there is a homomorphism between B and C then we can define an element in $\mathbb{E}(A,C).$

k-theory

modified 2 hours ago Aweygan 17k

2

votes

1

answer

16

views

Locally cyclic quotient and locally cyclic subgroup

abstract-algebra group-theory cyclic-groups normal-subgroups infinite-groups

answered 2 hours ago YCor 11.1k

0

votes

0

answers

10

views

Let Z(n) be the sum of remainders that n leaves when divided by 2, 3, 4, …, n − 1.

proof-writing

asked 2 hours ago Charles Hardris 1

2

votes

0

answers

19

views

A general formula for the parametrisation of the tangent space (in $\Bbb{R}^n$)

geometry multivariable-calculus differential-geometry parametrization tangent-spaces

modified 2 hours ago R. Burton 1,467

0

votes

0

answers

8

views

How to show that the following property is true?

optimization convex-analysis convex-optimization

asked 2 hours ago Frank Moses 1,279

0

votes

0

answers

2

views

Using RMSE and percent deviation

probability statistics

modified 2 hours ago tin 103

0

votes

0

answers

7

views

Could the set composed of real quaternion be represented by a Hilbert space?

hilbert-spaces quaternions

asked 2 hours ago Ali 1

2

votes

1

answer

21

views

Field extensions equal

field-theory galois-theory transcendence-theory

answered 2 hours ago Giovanni Deligios 1

0

votes

0

answers

9

views

Given an angle and an edge length, translate line segments from a straight line shape to a “regular polygon” shape

geometry trigonometry

asked 2 hours ago Dan 1

3

votes

1

answer

48

views

Commutativity of powers in $\Bbb Q$.

exponentiation irrational-numbers

modified 2 hours ago J.G. 53.4k

0

votes

0

answers

5

views

a general formula of certain Gauss sum

finite-fields gauss-sums

asked 2 hours ago Qing Zhang 706

0

votes

0

answers

7

views

Is the this Hankel matrix positive semi-definite?

linear-algebra eigenvalues-eigenvectors positive-definite symmetric-matrices

asked 2 hours ago KRL 166

0

votes

0

answers

8

views

Discrete Fourier transform frequency bins

fourier-transform fast-fourier-transform

asked 2 hours ago Lyngbakr 122

1

vote

0

answers

11

views

Giving the simplex category the structure of a site to define Kan complexes as sheaves.

simplicial-stuff topos-theory simplicial-complex

asked 2 hours ago Noel Lundström 485

0

votes

1

answer

21

views

Sorting different balls into different slots - check my proof

combinatorics proof-verification

modified 2 hours ago Philipp 339

1

vote

2

answers

27

views

Prove that $S-1$ is an isomorphism if $S:V\to V$ is a linear map and $S^n = 0$

linear-algebra

answered 2 hours ago Robert Lewis 54.2k

0

votes

0

answers

7

views

Could someone find an equation for modeling the shape of a 3d sweater. Standard shape. No pattern. On a curved plane.

calculus geometry differential

asked 2 hours ago user723354 1

1

vote

1

answer

11

views

Uniformly bounded variation of the Picard iteration

real-analysis functional-analysis

answered 2 hours ago daw 28k

1

vote

0

answers

9

views

Smoothness of eigenvalues of Hermitian matrix function in multiple variables

linear-algebra eigenvalues-eigenvectors perturbation-theory

asked 2 hours ago athleticCat 21

0

votes

0

answers

8

views

How do you find the 95% confidence interval for the true value of given integral?

integration matlab estimation monte-carlo confidence-interval

modified 3 hours ago Adrian Keister 7,957

0

votes

0

answers

5

views

Complexity problem with boolean functions.

boolean-algebra book-recommendation

asked 3 hours ago openspace 3,407

1

vote

0

answers

18

views

Automorphism with no square root

operator-theory hilbert-spaces

modified 3 hours ago user384617 106

0

votes

0

answers

8

views

Expansion (separate) the Heaviside function of two variables

integration step-function

modified 3 hours ago J. W. Tanner 19.7k

1

vote

0

answers

16

views

Applications of Sard's Theorem.

real-analysis functional-analysis differential-topology geometric-functional-analysis

asked 3 hours ago Mathew Westfields 51

0

votes

0

answers

8

views

Pappus centroid theorem. Where I do the mistake?

integration area solid-of-revolution

modified 3 hours ago Coder88 106

0

votes

0

answers

18

views

Minimum Domain Size to enumerate all $n \choose k$ combinations

linear-algebra combinatorics discrete-mathematics set-partition

modified 3 hours ago J1996 18

1

vote

2

answers

22

views

Addition/subtraction using logarithms

logarithms arithmetic

answered 3 hours ago Yves Daoust 148k

25

votes

3

answers

10k

views

Topologist's sine curve is not path-connected

general-topology connectedness path-connected

answered 3 hours ago Behnam Esmayli 2,102

2

votes

1

answer

42

views

17-gon derivation

geometry proof-explanation geometric-construction

modified 3 hours ago WE Tutorial School 1,850

0

votes

1

answer

32

views

Prove polynomial generates vector space, but it's not linear independence

linear-algebra polynomials vector-spaces

modified 4 hours ago WindSoul 97

2

votes

2

answers

20

views

Determining Weight function in Sturm Liouville problem

calculus ordinary-differential-equations eigenfunctions sturm-liouville

answered 4 hours ago Adrian Keister 7,957

5

votes

0

answers

51

views

Geometric intuition behind this chain homotopy

general-topology geometry algebraic-topology homology-cohomology homological-algebra

modified 4 hours ago Akerbeltz 958

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