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15

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Integral in $3D$

real-analysis calculus integration continuity solution-verification

modified 1 min ago Gord452 315

1

vote

0

answers

11

views

Is X should be full column rank in normal Gauss Markov model to make b estimable.

linear-algebra statistics statistical-inference regression

modified 1 min ago Facet 11

1

vote

0

answers

16

views

translation of a Jordan region

real-analysis calculus multivariable-calculus solution-verification volume

modified 1 min ago Gord452 315

0

votes

2

answers

25

views

what is mean of large subgroup?

group-theory algebraic-geometry algebraic-topology terminology definition

modified 1 min ago Shaun 23.6k

0

votes

1

answer

24

views

Finding the general term of this sequence $u_{n+1}+u_n=n$

sequences-and-series

answered 4 mins ago Aqua 72.6k

0

votes

1

answer

4

views

inverse laplace transform of exp(-s)F(s)

laplace-transform

modified 5 mins ago Aryadeva 24.4k

0

votes

0

answers

5

views

Average expected survival

probability

asked 6 mins ago Daniel says Reinstate Monica 1,113

0

votes

1

answer

24

views

Multi-choice: ${A=\int_{\pi}^{3\pi}\frac{|\cos(x)+\sin(x)|}{x}dx}$ satisfies which inequality?

definite-integrals

modified 7 mins ago Riemann'sPointyNose 2,662

0

votes

1

answer

44

views

Identify boolean function that satisfies some constrains

functions logic boolean-algebra constraints

modified 8 mins ago Paul Sinclair 27.8k

0

votes

1

answer

7

views

Linear law: how to determine three unknown constants from a non-linear equation?

algebra-precalculus systems-of-equations

modified 8 mins ago Kevin López Aquino 184

0

votes

1

answer

22

views

How do you find $P(C | A)$ and $P(C | A,B)$ of dependent events $A, B$, and $C$ given the following quantities?

probability conditional-probability

modified 9 mins ago RobPratt 13.8k

-1

votes

1

answer

26

views

Who first proved that $\mathbb{R}^n$ cannot be totally ordered ($n>1$)?

logic terminology order-theory

answered 10 mins ago Noah Schweber 170k

0

votes

0

answers

12

views

How can we find the pole of square root function?

roots

modified 10 mins ago JCAA 4,758

0

votes

0

answers

4

views

With Khinchine's inequality, prove Fourier basis is unconditional in $L^{p}[0,1]$ only for $p=2$.

banach-spaces harmonic-analysis schauder-basis

asked 10 mins ago Eric Yan 43

0

votes

0

answers

20

views

Question about probability terminology

probability probability-theory graph-theory terminology network

modified 11 mins ago RobPratt 13.8k

0

votes

1

answer

33

views

Questions on the proof of the strong law of large numbers

probability probability-theory probability-limit-theorems law-of-large-numbers

modified 12 mins ago RobPratt 13.8k

2

votes

0

answers

21

views

Book Request - General Relativity

differential-geometry reference-request book-recommendation general-relativity

modified 12 mins ago lloydy.99 83

0

votes

0

answers

5

views

If the blow up module $B_{\cal J} M$ is finitely generated, why is $M_n \oplus M_{n+1} \oplus \cdots$ generated by $M_n$ as a $B_I R$-module?

abstract-algebra commutative-algebra graded-rings graded-modules

modified 16 mins ago Al Jebr 9,345

0

votes

1

answer

12

views

Linear system with outer product and inverted matrix

linear-algebra matrices systems-of-equations symmetric-matrices outer-product

modified 16 mins ago phil 81

0

votes

0

answers

21

views

Showing that $(\mathbb{C}[x,y]/(xy))_x\cong \mathbb{C}[x]_x$

abstract-algebra algebraic-geometry commutative-algebra

modified 18 mins ago ponchan 1,039

0

votes

0

answers

8

views

Modeling with differential and difference equations

ordinary-differential-equations recurrence-relations mathematical-modeling

modified 19 mins ago Xander Henderson 19.9k

1

vote

1

answer

13

views

Second order derivative of a chain rule (regarding reduction to canonical form)

multivariable-calculus partial-differential-equations

modified 22 mins ago Jek Denys 79

0

votes

0

answers

14

views

Volume (or surface) of $d$-simplices ($d<n$) in $\mathbb{R}^n$

determinant volume simplex

modified 22 mins ago z32a7ul 105

0

votes

0

answers

11

views

Prove that for any $k$, $\forall x \, \, \, h(a+x)=h(a-x) \Longleftrightarrow \mu=0.5$

calculus definite-integrals symmetric-functions

asked 22 mins ago Masoud 2,335

2

votes

0

answers

15

views

Comparing the cardinalities of generic $\mathbb{R}$s

logic set-theory axiom-of-choice descriptive-set-theory forcing

modified 23 mins ago Noah Schweber 170k

0

votes

0

answers

13

views

Combinatorial interpretation of moments of usual law

combinatorics probability-theory probability-distributions

modified 24 mins ago JCAA 4,758

0

votes

1

answer

8

views

Let $C = [5, \infty) \cap \mathbb{Q}$. Prove that the derived set of $C$ is $[5, \infty)$

real-analysis

answered 25 mins ago JCAA 4,758

8

votes

1

answer

36

views

Find all functions $f:\Bbb R^+\to\Bbb R^+$ s.t. for all $x\in \Bbb R^+$ the following is valid: $f\bigg(\frac{1}{f(x)}\bigg)=\frac{1}{x}$

functional-equations

modified 26 mins ago Peter Foreman 19.1k

0

votes

4

answers

19

views

Prove that if $F$ is a family of sets and $A\in F$, then $\bigcap F\subseteq A$

elementary-set-theory solution-verification

modified 26 mins ago Khashayar Baghizadeh 737

1

vote

1

answer

24

views

Finding all units in the ring $\Bbb Z_{5} \times \Bbb Z_{8}$

abstract-algebra ring-theory

answered 27 mins ago Prasanna Maddila 11

0

votes

1

answer

10

views

What is the dependency between the equivalence of consistence and satisfiability, and correctness and completeness theorems?

logic computer-science first-order-logic satisfiability

modified 30 mins ago Noah Schweber 170k

0

votes

0

answers

3

views

Maximality of an ideal implies co-maximality

abstract-algebra ring-theory

asked 37 mins ago Gitika 323

9

votes

0

answers

55

views

Proof a 'well-known' result of Shimura on periods of modular forms

reference-request p-adic-number-theory modular-forms l-functions

modified 37 mins ago Arbutus 1,779

0

votes

0

answers

10

views

level curve and convex function

real-analysis calculus

asked 38 mins ago Ken 592

0

votes

0

answers

20

views

How to express any irrational number in radicals as a trigonometric expression

trigonometry irrational-numbers

asked 39 mins ago outmind 135

0

votes

1

answer

21

views

Personal proof to the notion that the set of rational numbers is countable

real-analysis discrete-mathematics elementary-set-theory

modified 39 mins ago José Carlos Santos 280k

3

votes

1

answer

58

views

Convergence of $\displaystyle\sum_{n=1}^{\infty}\frac{(2i)^{n}\cdot n!}{n^{n}}$

sequences-and-series complex-analysis convergence-divergence

modified 41 mins ago Bachamohamed 129

1

vote

0

answers

12

views

Example of distinct Lie algebras with the same derivation algebra?

lie-algebras

modified 42 mins ago Dry Bones 11

0

votes

0

answers

11

views

Show that $x < {n \over 1-P_x}$ where $P_x$ represents the CDF of gamma distribution.

probability probability-distributions gamma-distribution

modified 42 mins ago AxyuS 321

-1

votes

0

answers

21

views

Traveling Salesman Problem with the Nearest Neighbor Algorithm

combinatorics discrete-mathematics graph-theory hamiltonian-path

modified 43 mins ago yeet01 1

0

votes

0

answers

15

views

Is $(a,b) \in \phi \equiv \phi(a,b)$?

elementary-set-theory logic notation terminology

asked 45 mins ago Taylor Rendon 829

0

votes

0

answers

9

views

How to determine the coefficient $c_m$ in $ \sum_m^{\infty}c_me^{-m\mu}\cos m\theta=\sinh (\mu-\mu_b)\cos\theta$ on some surface $\mu=\mu(\theta)$

numerical-methods fourier-analysis fourier-series

modified 47 mins ago Yolbarsop 11

-1

votes

0

answers

20

views

Zeros of Riemann-Zeta function

number-theory

modified 47 mins ago Daniel 95

2

votes

0

answers

15

views

Can Definite integral get 2 answers due to the presence of square root?

integration definite-integrals roots

asked 48 mins ago ROBIN RAJ 329

7

votes

1

answer

805

views

Diffeomorphism invariance of the Ricci tensor

differential-geometry riemannian-geometry

answered 50 mins ago Prakhar Gupta 582

0

votes

0

answers

11

views

Conditional distributions being Gaussian implies joint distribution is also Gaussian?

probability statistics

asked 51 mins ago zhongyuan chen 525

1

vote

0

answers

11

views

Proof of Morera's Theorem for Triangular Contours

complex-analysis solution-verification contour-integration cauchy-integral-formula

asked 52 mins ago Peter Foreman 19.1k

2

votes

2

answers

39

views

To show a subset of $\Bbb{Q}$ isn't a subring

abstract-algebra ring-theory

modified 55 mins ago mathcounterexamples.net 38.8k

-1

votes

0

answers

7

views

Simple Regression in statistics

regression

modified 56 mins ago Aryadeva 24.4k

0

votes

0

answers

4

views

segment whose ends are the points of intersection between the Euler line and the triangle

analytic-geometry

asked 56 mins ago Wilson Massaro 113

1

vote

1

answer

9

views

Identities with respect to composition

abstract-algebra category-theory morphism

answered 57 mins ago Berci 74.1k

0

votes

0

answers

20

views

Number of non-zero solutions of an equation in $F \times F$ where $F$ is a field

abstract-algebra ring-theory

asked 1 hour ago Shivani 99

1

vote

1

answer

20

views

Primes, Digits, and Number Theory in Competition Math

number-theory

answered 1 hour ago Ross Millikan 340k

2

votes

2

answers

41

views

Branch cut of square root

complex-analysis branch-cuts

modified 1 hour ago Yves Daoust 177k

0

votes

0

answers

38

views

An observation about the Collatz trajectory starting from $N=993$

number-theory

modified 1 hour ago Pepperfogastre 27

0

votes

0

answers

7

views

an $n$-gon is a jordan region

real-analysis calculus geometry multivariable-calculus solution-verification

modified 1 hour ago user3472 165

1

vote

1

answer

24

views

Nilpotents of $\Bbb{Z}_n$

abstract-algebra ring-theory

answered 1 hour ago jaRedDRedmp 26

1

vote

0

answers

9

views

Subspace of $H^1(\Omega)$ is closed?

general-topology sobolev-spaces

asked 1 hour ago Raphaël 105

1

vote

1

answer

22

views

The set of all finite subsets of $\mathbb{R}$+ is countable.

discrete-mathematics

answered 1 hour ago The73SuperBug 903

3

votes

0

answers

77

views

Interpretation of probability statements in Nina Zubrilina's paper

probability combinatorics graph-theory

modified 1 hour ago Michael Hardy 238k

-1

votes

0

answers

11

views

let $x-y= a \in \mathbb{R}$ and $f(x,y)=\cos(x)-\cos(y)$ the now what $a$ be that $f$ Have an absolute maximum and an absolute minimum?

calculus

asked 1 hour ago justin32 67

1

vote

0

answers

17

views

Is it possible to rewrite this proof in a more intuitive form?

proof-writing proof-explanation first-order-logic

asked 1 hour ago Patrick Browne 195

0

votes

0

answers

17

views

question regarding polyhedra in algebraic topology

algebraic-topology

asked 1 hour ago a math lover 25

1

vote

1

answer

18

views

Find the angle that lets you make a bendy pipe

inverse kinematics

answered 1 hour ago Ross Millikan 340k

3

votes

1

answer

86

views

Prime ideals in quadratic ring $\mathbb{Z}[\sqrt{-5}]$

ring-theory

modified 1 hour ago Maestro13 1,471

-1

votes

0

answers

11

views

getting consecutive series by modulo

combinatorics elementary-number-theory modular-arithmetic

asked 1 hour ago ned grekerzberg 857

1

vote

0

answers

20

views

Katz's proof of Cartier's (descent) theorem

algebraic-geometry proof-explanation connections quasicoherent-sheaves positive-characteristic

asked 1 hour ago clarkkent 31

0

votes

0

answers

24

views

How to solve summation convention

linear-algebra reference-request

modified 1 hour ago Meilton 23

1

vote

2

answers

34

views

How to solve the ODE $y' = \frac{x+y-2}{y-x-4}$?

calculus integration ordinary-differential-equations indefinite-integrals

modified 1 hour ago Michael Hardy 238k

2

votes

1

answer

31

views

Sweedler Notation: $\eta\epsilon$ is the identity element of the convolution product

abstract-algebra solution-verification convolution hopf-algebras coalgebras

modified 1 hour ago Phi_24 757

0

votes

0

answers

13

views

Show $\mathbb{E}[ t^{\sum_{j=1}^n \mathrm{1}_{\{v_i = j\}}Z_j}] = \frac{E[t^Z] - 1 + \eta} \eta $

probability probability-theory expected-value

modified 1 hour ago Michael Hardy 238k

0

votes

0

answers

14

views

What is the connection between divisors and line bundles?

algebraic-geometry algebraic-curves divisors-algebraic-geometry line-bundles

asked 1 hour ago gradintherockies 55

1

vote

0

answers

9

views

Characterization of the continuity of a linear map $u:A \subset E \to F$ defined in a subspace $A$ of an $LF-$space $E$

functional-analysis continuity topological-vector-spaces

modified 1 hour ago Victor Hugo 1,141

1

vote

0

answers

23

views

Are there necessarily positive and negative points to this function?

calculus integration

modified 1 hour ago Yechiel Merzbach 11

4

votes

2

answers

28

views

Finding the Last Eigenvalue for a Matrix

linear-algebra

answered 1 hour ago mechanodroid 36.5k

0

votes

1

answer

16

views

Change of measure

stochastic-calculus brownian-motion stochastic-analysis

answered 1 hour ago WoolierThanThou 8,972

1

vote

0

answers

19

views

Consider the function f ( x ) = x^2 + 2 mod 17 . Use the two-pebble algorithm to determine the following parameters for starting point x = 0 .

functions

asked 1 hour ago Anonymous Molecule 77

2

votes

1

answer

15

views

Practical algorithm to calculate power subgroup of a polycyclic group

group-theory algorithms gap solvable-groups computational-algebra

answered 1 hour ago Derek Holt 64.6k

0

votes

0

answers

18

views

Does function $f(x,y,z) = \frac{1}{\|\mathbf{x}\|}+\sin(x^2y)\cos(z-7)$ belong to space $L^k(B)$ for $k = 1, 2, 3, 4$?

integration norm lp-spaces

modified 2 hours ago Michael Hardy 238k

0

votes

0

answers

19

views

The finite-dimensional distributions for a Wiener process are given by this formula?

probability-distributions reference-request stochastic-processes brownian-motion wiener-measure

modified 2 hours ago Andrew Shedlock 955

0

votes

0

answers

7

views

From pointwise convergence in probability to uniform convergence in probability for non-decreasing random processes

convergence-divergence stochastic-processes

asked 2 hours ago Fabien 116

0

votes

1

answer

27

views

Ergodic Transformation on $[0,1]^2$

measure-theory ergodic-theory

modified 2 hours ago JCAA 4,758

0

votes

0

answers

9

views

Are powers of Hardy-Hilbert functions still Hardy-Hilbert?

complex-analysis convergence-divergence taylor-expansion hardy-spaces

asked 2 hours ago Good Boy 832

0

votes

0

answers

7

views

Give aCubic spline

numerical-methods

asked 2 hours ago عباس علي 1

3

votes

0

answers

10

views

Prove that biconditional cannot be expressed in terms of implication alone.

logic

asked 2 hours ago antrep1234 51

4

votes

0

answers

203

views

Sum involving incomplete beta functions

integration asymptotics special-functions hypergeometric-function beta-function

modified 2 hours ago ARWarrior 239

2

votes

0

answers

38

views

How to prove that $\mathbb{E}[R_n]=o(\sqrt{n})$

probability probability-theory

modified 2 hours ago BlueCharlie 116

0

votes

0

answers

68

views

Why we cant solve $y''+y\sin(x)=0$

ordinary-differential-equations

modified 2 hours ago metamorphy 17k

0

votes

0

answers

10

views

Given $r_1$ alphas and $r_2$ betas, probability that the arrangement contains exactly $k$ runs of either kind is

probability combinatorics

asked 2 hours ago Shew 1,199

0

votes

0

answers

15

views

What is the notation for total number of rows in a matrix S?

matrices notation

asked 2 hours ago MeMa 11

1

vote

1

answer

18

views

How to make function that calculates the probability of two bugs will meet within 8s timesteps?

probability logic

modified 2 hours ago Kyky 968

11

votes

4

answers

278

views

Factor $x^5-x+15$

polynomials factoring quintic-equations

modified 3 hours ago Travis Willse 76.1k

2

votes

0

answers

11

views

Product of two functions in $H^1$( or $W^{1,2}$) is in $H^{\frac{1}{2}}$.

sobolev-spaces distribution-theory

asked 3 hours ago Lev Bahn 2,418

2

votes

0

answers

86

views

Algebra vs. Geometry: understanding a quote by Michael Atiyah

abstract-algebra geometry soft-question math-history

modified 3 hours ago Arctic Char 2,365

1

vote

0

answers

11

views

Norm equivalences for Gaussian random functions (Cameron-Martin space)

functional-analysis measure-theory hilbert-spaces stochastic-integrals reproducing-kernel-hilbert-spaces

modified 4 hours ago ares 386

4

votes

1

answer

61

views

Define $X_n=\sum_{k=1}^n kx_k$ and $Y_n=\sum_{k=1}^n ky_k$. Prove that there exists an $n$ such that $X_n<Y_n$.

real-analysis measure-theory convergence-divergence

modified 4 hours ago Subhajit 399

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