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0

votes

1

answer

22

views

Are the two spans equal?

linear-algebra vectors

modified 2 mins ago amWhy 199k

0

votes

1

answer

9

views

is my answer about probability correct?

probability probability-distributions

modified 2 mins ago tommik 11.8k

0

votes

0

answers

12

views

How do I solve this exercise of double integral $\iint_{D}\frac{1}{x^{2}+y^{2}}dA$?

integration multivariable-calculus multiple-integral

modified 48 secs ago Gary 6,765

0

votes

0

answers

5

views

If $f$ is positive decreasing and continuous on $[0, \infty)$ I want to show that $\Sigma_{n=m+1}^{\infty} f(n) \leq \int_m^{\infty} f(t) \, dt$.

real-analysis

asked 2 mins ago E2R0NS 82

0

votes

1

answer

19

views

How do i proceed with this integral?need help to evaluate this one

integration multivariable-calculus

answered 4 mins ago Henry Lee 5,846

0

votes

0

answers

10

views

I have to create two way table from a data given to me it has the cities and number of accidents,number of deaths in the year 2018

probability statistics

modified 5 mins ago Henry 123k

0

votes

0

answers

3

views

Proof that the adjoint operator of $\Phi$ is $\Phi(\sigma)=\sum_{i}A_{i}^{*}\sigma B_{i}$ in terms of Kraus operators.

linear-algebra operator-theory inner-product-space adjoint-operators quantum-information

modified 5 mins ago Senna 59

0

votes

0

answers

27

views

Number of Integer Solutions (can be negative)

combinatorics

modified 5 mins ago trevormil 11

0

votes

1

answer

21

views

Is the open ball compact?

general-topology metric-spaces

modified 5 mins ago ECL 2,150

1

vote

0

answers

6

views

Representing a graph theory property using propositional logic

logic graph-theory computer-science propositional-calculus

asked 5 mins ago sweetvel 11

1

vote

2

answers

11

views

The ideal $(0)$ is maximal in $\mathbb{Q}$ but not $\mathbb{Z}$?

abstract-algebra ring-theory ideals

modified 5 mins ago rschwieb 129k

0

votes

0

answers

5

views

A question regarding conditional independence

conditional-probability independence

modified 6 mins ago GNUSupporter 8964民主女神地下教會 15.3k

0

votes

1

answer

13

views

Is a ring automorphism restricted to the invertibles the identity automorphism?

abstract-algebra polynomials ring-theory

answered 7 mins ago Marktmeister 821

-1

votes

0

answers

16

views

How can I simplify and solve this integral?

integration

modified 8 mins ago Wisdom 309

0

votes

0

answers

5

views

Consequences of negating Russell's infinity axiom in FOL

first-order-logic infinity

asked 8 mins ago Qwerty 11

0

votes

0

answers

7

views

Finding the invariant of a linear transformation

linear-transformations matrix-equations symmetry

asked 8 mins ago Habib Ayati 1

0

votes

1

answer

24

views

Show that $\Phi \vDash \psi \Longleftrightarrow \Phi \cup \{\lnot \psi\} \ \text{is not satisfiable}$

discrete-mathematics logic predicate-logic satisfiability

modified 9 mins ago Mauro ALLEGRANZA 81.6k

1

vote

0

answers

16

views

A convex set is homeomorphic to cone of its boundary

general-topology convex-geometry

modified 10 mins ago GNUSupporter 8964民主女神地下教會 15.3k

0

votes

0

answers

7

views

homogenous equation substitution mistake

ordinary-differential-equations

asked 10 mins ago jane 49

-1

votes

0

answers

7

views

Formal arithmetic's representation of primitive recursive functions

propositional-calculus

asked 10 mins ago Martin 1

1

vote

2

answers

33

views

Euler circuits for the graph

graph-theory eulerian-path

modified 11 mins ago Hendrix 1,068

0

votes

0

answers

12

views

Unbounded Integral

integration limits improper-integrals upper-lower-bounds

asked 11 mins ago Kumar 236

1

vote

0

answers

11

views

Evans Partial Differential Equations, chapter 7 exercise 1 (uniqueness of a regular solution to the heat equation with Neumann boundary conditions)

integration multivariable-calculus partial-differential-equations parabolic-pde

modified 11 mins ago Akerbeltz 1,563

1

vote

0

answers

3

views

Are multiplication operators surjective on $L^1$?

real-analysis measure-theory lp-spaces sobolev-spaces

asked 14 mins ago Romeo 5,480

0

votes

1

answer

22

views

why $\cfrac{d^2y}{dx^2}=\cfrac{\dfrac{d}{dt}\left(\dfrac{dy}{dx}\right)}{\dfrac{dx}{dt}}$?

calculus derivatives

answered 51 secs ago soheil 518

6

votes

1

answer

340

views

+100

Uniqueness of solution of an integral equation [Updated]

real-analysis functional-analysis functional-equations integral-equations

modified 22 mins ago Anonymous 24

0

votes

0

answers

18

views

prove inequality in combinatorics

combinatorics

asked 26 mins ago user249018 951

0

votes

0

answers

17

views

Finding Power Law constants

power-series

modified 31 mins ago caio villaca 111

0

votes

0

answers

11

views

3D polyhedron with no axis of symmetry

geometry

asked 31 mins ago Quarantiner 80

0

votes

0

answers

49

views

How do I solve this equation analytically?

real-analysis calculus integration algebraic-geometry

modified 34 mins ago Gae. S. 16.5k

1

vote

2

answers

17

views

Example of a basis which is not a Riesz basis?

functional-analysis analysis hilbert-spaces unbounded-operators

answered 34 mins ago Anonymous 24

0

votes

0

answers

4

views

How to show that this poset has a fixed point property?

order-theory fixed-points

asked 34 mins ago Dilettante 23

0

votes

1

answer

7

views

Show that the decimal representation map is ergodic using Fourier series.

analysis fourier-analysis dynamical-systems fourier-series ergodic-theory

answered 35 mins ago Adam 1,590

1

vote

1

answer

19

views

Prove it by using that $f^{-1}$ of an open set is open

metric-spaces

modified 37 mins ago Ryszard Ebgelking 1,731

0

votes

0

answers

28

views

how do i find the point where the two tangents are perpendicular to each other

conic-sections

asked 40 mins ago Meet Lalwani 1

1

vote

0

answers

14

views

A question about the existence of a $k\times k$ matrix $X$ such that $X^n=A$ for a given matrix $A$.

linear-algebra matrices

modified 43 mins ago boaz 3,559

-1

votes

0

answers

12

views

Q/SPHERICAL COORINATES X=r sin∅ cosθ y=r sin∅ sinθ z=r cos∅ r^2=x^2+y^2+z^2 Determine also parallel vector fields. By differential geometry

ordinary-differential-equations

modified 44 mins ago SNEHIL SANYAL 773

1

vote

1

answer

22

views

Weierstrass nowhere differentiable function is Lip$_\alpha$ for $\alpha < 1$

real-analysis analysis continuity lipschitz-functions

answered 44 mins ago David C. Ullrich 77k

1

vote

0

answers

11

views

Sylow p-subgroups of $S_{7}$ and $D_{12}$

group-theory sylow-theory dihedral-groups

asked 44 mins ago user855854 11

0

votes

0

answers

20

views

Derivative of arcsin, question on provided proof

calculus derivatives

asked 48 mins ago Nick 339

3

votes

2

answers

109

views

The functional equation $\big(1 + yf(x)\big)\big(1 - yf(x + y)\big) = 1$ for $f:\mathbb R^+\to\mathbb R^+$

contest-math functional-equations

modified 49 mins ago Mohsen Shahriari 4,151

-1

votes

0

answers

14

views

Calculate $Projection_{v_{1}}(v) + Projection_{v_{2}}(v) + Projection_{e_{1}}(v) + Projection_{e_{2}}(v)$

linear-algebra vectors

asked 54 mins ago Manuelma4 11

0

votes

1

answer

47

views

How to find all functions $f:\mathbb R\to\mathbb R$ such that $\forall a,b\in\mathbb R$: $f(a)+f\big(a+f(b)\big)=b+f\big(f(a)+f^2(b)\big)$

functional-equations

modified 56 mins ago Martin Sleziak 51.8k

0

votes

0

answers

8

views

Gram-Schmidt orthogonalization procedure - prove some properties

linear-algebra

asked 56 mins ago Brasilian_student 39

0

votes

0

answers

6

views

A question on Fourier transform with bounded variation

fourier-analysis fourier-transform

modified 58 mins ago walter 1

0

votes

0

answers

8

views

Eigenvalue sensitivity

linear-algebra eigenvalues-eigenvectors numerical-linear-algebra

asked 58 mins ago user572780 63

0

votes

0

answers

5

views

Schwarz inequality-a degenerate case with 0

statistics expected-value statistical-inference cauchy-schwarz-inequality

asked 59 mins ago user852508 11

2

votes

0

answers

7

views

Low Rank Special-Orthogonal Matrix Representation

linear-algebra lie-groups lie-algebras

asked 1 hour ago Wasserstein's Apprentice 25

-1

votes

1

answer

7

views

existence of faithful state in the predual of a von Neumann algebra

operator-theory operator-algebras c-star-algebras von-neumann-algebras

answered 1 hour ago Ruy 3,707

0

votes

0

answers

27

views

Sum Identity with x and y

sequences-and-series summation

modified 1 hour ago calculatormathematical 419

0

votes

1

answer

20

views

Are all these 3 graphs correct f(x)=x^2

functions

answered 1 hour ago Stinking Bishop 8,300

0

votes

0

answers

21

views

Coordinate expression for the Cotangent Lift

differential-geometry symplectic-geometry

modified 1 hour ago rob0rt 1

0

votes

0

answers

14

views

One Theorem and example in Recursive Formula

calculus linear-algebra asymptotics recurrence-relations recursion

modified 1 hour ago Davied Zuhraph 426

0

votes

0

answers

5

views

Product rule of “integration element” in Lebesgue-Stieltjes integral

derivatives probability-distributions lebesgue-integral lebesgue-measure stieltjes-integral

asked 1 hour ago Rastafan 1

0

votes

0

answers

19

views

Limit involving a factorial term

real-analysis calculus

modified 1 hour ago eloparti 95

1

vote

0

answers

7

views

Injectivity of quiver representation

linear-algebra quiver

asked 1 hour ago Jamie Winter Nilsson 153

0

votes

0

answers

5

views

Periods of a holomorphic differentials under change of variables

complex-analysis algebraic-geometry differential-forms riemann-surfaces elliptic-integrals

modified 1 hour ago VECH 445

0

votes

0

answers

12

views

Locally Lipschitz

real-analysis functional-analysis

asked 1 hour ago Mr. Cunha 1

0

votes

0

answers

15

views

Probability generating functions understanding

probability stochastic-processes generating-functions

modified 1 hour ago GNUSupporter 8964民主女神地下教會 15.3k

0

votes

0

answers

23

views

bivariate conditional Gaussian

probability conditional-expectation gaussian-integral gaussian bivariate-distributions

modified 1 hour ago tommik 11.8k

0

votes

0

answers

19

views

maximum matching in bipartite graphs

combinatorics discrete-mathematics graph-theory bipartite-graphs matching-theory

asked 1 hour ago Billy 35

0

votes

0

answers

6

views

One-sided alternative hypothesis

statistics statistical-inference hypothesis-testing

modified 1 hour ago Marca85 93

2

votes

0

answers

52

views

+50

Binomial identity involving Harmonic numbers

combinatorics summation binomial-coefficients harmonic-numbers

modified 1 hour ago ablmf 5,987

0

votes

0

answers

6

views

Why should i use quantifiers in tuple relational calculus

quantifiers

asked 1 hour ago Jag 75

1

vote

2

answers

160

views

Real Spectral Theorem Induction Proof

linear-algebra abstract-algebra

answered 1 hour ago James Jian 1

1

vote

0

answers

27

views

Every planer graph $G$ is $5$-colorable

graph-theory coloring planar-graphs

modified 1 hour ago Avra 67

0

votes

0

answers

13

views

Calabi Yau Manifold equation

geometry string-theory

asked 1 hour ago poniedzialek1001 1

6

votes

1

answer

176

views

+100

Boundedness in probability of Stochastic Process

probability solution-verification brownian-motion upper-lower-bounds

modified 1 hour ago Riccardo Ceccon 1,348

0

votes

0

answers

20

views

Any simply-connected non-compact surface with boundary is obtained from closed unit disc after removing a closed set from the boundary circle

algebraic-topology differential-topology surfaces geometric-topology manifolds-with-boundary

modified 1 hour ago 0-th User Sumanta 6,850

0

votes

0

answers

10

views

Convex Hull of Some Homeomorphic Sets are Homeomorphic

convex-geometry

asked 1 hour ago user3.1415 128

0

votes

0

answers

9

views

Placing balls in urns and then comparing our sorting arrangements

probability probability-distributions conditional-probability

asked 1 hour ago Dio 303

1

vote

0

answers

14

views

Values of a random variable $x(t)$

stochastic-processes

modified 1 hour ago Assassinos 53

1

vote

0

answers

27

views

What is known about Lebesgue's universal covering problem in three dimensions?

geometry reference-request convex-geometry solid-geometry

modified 1 hour ago RavenclawPrefect 2,879

1

vote

1

answer

23

views

Simple graph is a Hamiltonian graph

combinatorics graph-theory proof-writing hamiltonian-path

answered 1 hour ago Amit Rajaraman 2,010

0

votes

0

answers

10

views

Zero weak gradient implies almost everywhere constant

real-analysis reference-request sobolev-spaces weak-derivatives

asked 1 hour ago warm_fish 521

0

votes

0

answers

13

views

Prove that Cantor distribution is continuous

probability random-variables cantor-set

asked 1 hour ago FreeZe 1,538

1

vote

1

answer

15

views

Equivalent condition for tightness of probability measures on a Banach space

probability-theory measure-theory banach-spaces compactness weak-convergence

modified 2 hours ago David C. Ullrich 77k

0

votes

0

answers

6

views

Mean $L_1$-error of naive kernel density estimator

probability density-function estimation estimation-theory

asked 2 hours ago fpmoo 642

21

votes

2

answers

738

views

A subgroup such that every left coset is contained in a right coset.

abstract-algebra group-theory

answered 2 hours ago Nicky Hekster 36.6k

2

votes

1

answer

18

views

Polish notation, rooted tree

polish-notation

modified 2 hours ago Rob Arthan 34.6k

3

votes

4

answers

105

views

$\int_0^1f(x) dx =0$, $\int_0^1xf(x) dx =0$. How to show that f has at least two zeros?

real-analysis calculus definite-integrals

modified 2 hours ago Clement Yung 5,958

1

vote

0

answers

17

views

General version of Cauchy-Lipschitz

real-analysis ordinary-differential-equations

modified 2 hours ago Reda Jlibene 56

1

vote

0

answers

7

views

Application of universal property of module direct sum

abstract-algebra modules direct-sum universal-property

asked 2 hours ago 真就白给啊 55

0

votes

0

answers

11

views

Product-measurability and Partial Continuity Imply Joint Measurability

general-topology measure-theory continuity topological-vector-spaces

asked 2 hours ago Ramen 1,050

0

votes

0

answers

12

views

Simplistic simulation of double pendulum doesn't work. Is this approach valid?

calculus numerical-methods physics

asked 2 hours ago Elias Mårtenson 101

0

votes

0

answers

20

views

Is there any preferences between these two plots?

functions graphing-functions

modified 2 hours ago charmin 128

0

votes

0

answers

9

views

Arrange points in a high-dimensional space when you only have distances (no coordinates)

geometry coordinate-systems clustering

asked 2 hours ago Hubert Schölnast 752

1

vote

0

answers

9

views

Select the necessarily true statements involving conditional expectation and the joint Gaussian distribution of $X$ and $Y$

conditional-probability conditional-expectation gaussian

asked 2 hours ago rl4y 69

0

votes

0

answers

7

views

Heat equation with insulated ends

partial-differential-equations heat-equation symmetry spheres

asked 2 hours ago João 1

0

votes

0

answers

11

views

Jacobian of transformation that reverses the order of elements of a vector

calculus group-theory permutations permutation-cycles

modified 2 hours ago Euler_Salter 3,484

1

vote

0

answers

12

views

Convergence of the double series $\sum_{d|n} \mu(d) x_{n}$

real-analysis convergence-divergence analytic-number-theory arithmetic-functions mobius-function

modified 47 secs ago Ma Joad 5,768

0

votes

0

answers

7

views

Given compact set is spectrum and also approximate point spectrum

functional-analysis banach-algebras

asked 2 hours ago probafds123 213

0

votes

0

answers

5

views

A convexity principle for multiple complex variables

complex-analysis

asked 2 hours ago Desiderius Severus 1,266

0

votes

1

answer

16

views

Plotting parametric curve with implicit parameter function

classical-mechanics parametrization maple bifurcation

answered 2 hours ago Claude Leibovici 173k

6

votes

1

answer

35

views

(Topologically) different tangent bundles on a same manifold

differential-geometry differential-topology examples-counterexamples smooth-manifolds vector-bundles

answered 2 hours ago Michael Albanese 77.9k

3

votes

1

answer

18

views

Claim of convexity of unitaries with $\|U\|_\infty \leq 1$ for a minimax theorem

linear-algebra matrices convex-analysis supremum-and-infimum unitary-matrices

answered 3 hours ago daw 34.1k

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