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2

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When does $\int \frac{dx}{x} = ln|x|$ and when $\int \frac{dx}{x} = ln(x)$?

calculus ordinary-differential-equations pde

answered 1 min ago Adrian Keister 6,775

0

votes

0

answers

1

view

How many conjugacy classes of subgroups of order $p$ does $GL_{3}(Z / pZ)$ have?

combinatorics group-theory finite-groups group-cohomology

2 mins ago Nourddine Snanou 72

0

votes

0

answers

23

views

Variance of stochastic integral with respect to compensated Poisson process

probability stochastic-processes stochastic-calculus stochastic-integrals stochastic-analysis

modified 2 mins ago Galvin Ng 138

0

votes

0

answers

6

views

Likelyhood that third set is alike first or second

probability probability-distributions

asked 4 mins ago T4iga 1

0

votes

1

answer

19

views

Intuition behind general solution of linear differential equation?

ordinary-differential-equations

modified 5 mins ago Daniele Tampieri 3,152

0

votes

0

answers

6

views

Interpretation of Complex disc around origin as a variety

algebraic-geometry complex-geometry projective-schemes

asked 6 mins ago HARRY 146

0

votes

0

answers

6

views

if a spin group is not simply connected, can the manifold be?

group-theory connectedness spin-geometry

asked 6 mins ago bguner 1

5

votes

2

answers

4k

views

What are the rules for basic algebra when modulo real numbers are involved

linear-algebra modular-arithmetic

modified 7 mins ago user7214865 105

1

vote

1

answer

32

views

Show that $\lim_{n\rightarrow \infty}\frac{\mathsf {Var}[Y_1 + \dots + Y_n]}{n^2} = 0.$

probability probability-theory

answered 7 mins ago lonza leggiera 3,339

1

vote

1

answer

21

views

convergence of series involving Appell function

integration sequences-and-series hypergeometric-function

answered 7 mins ago Yuriy S 18.2k

0

votes

0

answers

7

views

Is my understanding of differential forms integration correct?

integration differential-geometry differential-forms surface-integrals

asked 8 mins ago Peter4075 404

0

votes

0

answers

12

views

lower bound of the difference between two numbers

real-analysis

asked 8 mins ago secular 1

2

votes

1

answer

12

views

How can types represent both sets and propositions in Lambda calculus?

logic set-theory lambda-calculus type-theory

modified 9 mins ago William Oliver 249

2

votes

2

answers

35

views

Interpretation of Wikipedia formula relating curvature form and curvature tensor

differential-geometry notation riemannian-geometry differential-forms curvature

answered 17 mins ago C.F.G 1,734

0

votes

0

answers

6

views

minimization containing a large matrix

matrices optimization

asked 17 mins ago user0131 35

2

votes

1

answer

35

views

Suggest some journals that I can try to publish my paper in?

publishing

answered 18 mins ago poetasis 752

0

votes

1

answer

19

views

Show that if the height of a prime ideal is zero, then it is a prime ideal belonging to 0

abstract-algebra commutative-algebra dimension-theory

answered 18 mins ago Es.Ro 1,115

2

votes

2

answers

29

views

Understand a certain step in the mean value theorem.

calculus analysis proof-explanation

modified 19 mins ago Ahmed Hossam 917

0

votes

0

answers

7

views

a topological mixing example

general-topology dynamical-systems ergodic-theory

asked 20 mins ago Reza 19

2

votes

2

answers

55

views

Counting the Number of Votes by Induction

combinatorics induction

modified 22 mins ago Abr001am 659

0

votes

3

answers

30

views

Can’t get to standard form of linear differential equation

ordinary-differential-equations

answered 22 mins ago trula 1

0

votes

0

answers

3

views

Recurrence time for 1-D random walk with different moving proability and stride

stochastic-processes random-walk

asked 22 mins ago Bloodmoon 284

1

vote

1

answer

59

views

Complex number set has least upper bound property?

complex-numbers

modified 23 mins ago Martín-Blas Pérez Pinilla 36.4k

1

vote

1

answer

44

views

The law of the excluded-middle in modal logic

modified 24 mins ago lemontree 2,680

0

votes

0

answers

4

views

Differential structures of sum bundle, tangent bundle, dual bundle, tensor bundle, quotient bundle, etc

differential-geometry vector-bundles tangent-bundle

asked 25 mins ago tommy1996q 748

0

votes

0

answers

7

views

Definite integration of Weierstrass sigma and Jacobi theta function

definite-integrals special-functions elliptic-functions

asked 27 mins ago Francesco Arnaudo 107

0

votes

1

answer

15

views

Considering quantity which a random variable depends on as own random variable

probability probability-theory conditional-expectation conditional-probability independence

modified 28 mins ago pche8701 120

1

vote

0

answers

12

views

ordinal numbers and topology

general-topology book-recommendation ordinals

asked 31 mins ago giannispapav 2,190

3

votes

0

answers

46

views

What is the realcompactification of the real line?

real-analysis general-topology functional-analysis analysis

modified 32 mins ago Rajaei 66

1

vote

0

answers

31

views

Doubt in Stokes' theorem & line integral

calculus vector-analysis line-integrals stokes-theorem

modified 34 mins ago Bernard 131k

0

votes

0

answers

15

views

global sections of a line bundle

algebraic-geometry schemes projective-schemes line-bundles

modified 35 mins ago Bernard 131k

1

vote

1

answer

20

views

Big subalgebras of the free polynomial algebra

commutative-algebra

modified 36 mins ago hello 151

1

vote

0

answers

26

views

Upper bounding matrix operator norm of by covering sub-matrices

linear-algebra matrices analysis matrix-calculus

modified 37 mins ago Tony Liao 6

-3

votes

1

answer

10

views

Optimization and Related Rates

optimization

answered 40 mins ago trula 1

1

vote

2

answers

56

views

How to draw graph of $|x+y-1| + |2x + y + 1|=1$?

algebra-precalculus graphing-functions

modified 40 mins ago Dr. Sonnhard Graubner 87.3k

5

votes

1

answer

1k

views

Proving stationarity of AR(1) process

stationary-processes

modified 41 mins ago Community♦ 1

3

votes

1

answer

33

views

Find example of left Engel elements in group

abstract-algebra group-theory

answered 41 mins ago fourier1234 787

1

vote

1

answer

28

views

Finding right transversals using GAP

gap

modified 43 mins ago ahulpke 7,912

2

votes

1

answer

63

views

Equivalence of wedge and tensor product with Levi-Civita symbol

tensor-products tensors exterior-algebra

modified 44 mins ago lisyarus 11.7k

3

votes

1

answer

27

views

what are the inner angles of a tetragonal trapezohedron

geometry polyhedra metric-geometry

modified 46 mins ago Joseph O'Rourke 18.8k

1

vote

0

answers

10

views

Proving inequality for an L-smooth bounded function

convex-analysis convex-optimization duality-theorems

asked 49 mins ago Aritra Das 2,073

8

votes

0

answers

61

views

No bounded surjective linear map $L^{\infty} \to L^1$

functional-analysis lp-spaces

modified 50 mins ago Nick 1,746

3

votes

1

answer

86

views

Finite Engel group is nilpotent.

abstract-algebra group-theory finite-groups nilpotent-groups

answered 54 mins ago fourier1234 787

0

votes

0

answers

6

views

Invariance of joint distribution of leave-one-out sequences of random variables

probability-theory probability-distributions random-variables independence stationary-processes

asked 55 mins ago madnessweasley 599

0

votes

0

answers

60

views

A PID with countably infinitely many prime ideals that does not embed into complex numbers and is not a localization

commutative-algebra

modified 57 mins ago hello 151

0

votes

1

answer

25

views

Showing a function $\Bbb Z/5\to\Bbb Z/5$ is surjective

discrete-mathematics modular-arithmetic set-theory

answered 59 mins ago trula 1

1

vote

2

answers

18

views

Approximating a general process by a simple process in definition of integration wrt Brownian motion

stochastic-integrals

modified 1 hour ago UBM 6

1

vote

1

answer

20

views

Derivative of Projection on Manifolds

differential-geometry differential-topology

modified 1 hour ago Devendra Singh Rana 822

3

votes

1

answer

40

views

If $e_1,\dots,e_n\in R$ are idempotent then $\langle e_1,\dots,e_n\rangle=\langle d\rangle$ for some idempotent $d\in R$

abstract-algebra ring-theory ideals idempotents

modified 1 hour ago J. Doe 602

2

votes

1

answer

39

views

Flats of the dual matroid and unions of circuits of the matroid

combinatorics graph-theory proof-writing matroids

answered 1 hour ago Aaron Dall 656

0

votes

0

answers

11

views

Calculating probability of Type II Error

hypothesis-testing

asked 1 hour ago Lorenzo 4

0

votes

0

answers

13

views

Classify countable algebraically closed fields of characteristic $0$

field-theory

modified 1 hour ago hello 151

0

votes

1

answer

47

views

Prove that the spectrum of normal matrices is stable under small perturbations

linear-algebra matrices eigenvalues-eigenvectors

answered 1 hour ago glS 940

1

vote

0

answers

6

views

How to define a performance measure for linear regression with some variable errors?

linear-regression regression-analysis error-propagation

modified 1 hour ago Ali 6

1

vote

1

answer

26

views

Let $A_p=a^{2^p}+b^{2^p}$. Prove that $(A_p,A_q)=1\forall p\ne q$

number-theory fermat-numbers

modified 1 hour ago metamorphy 7,595

-1

votes

0

answers

30

views

Finding $f(x)$ for $α<x<β$

ordinary-differential-equations functions continuity dirac-delta

modified 1 hour ago Korra 75

0

votes

0

answers

37

views

How does one test whether a family of random variables satisfies on average a growth relation based on their ranks?

statistics hypothesis-testing

modified 1 hour ago kakarotto 1

6

votes

1

answer

82

views

What is the series $\sum_{n=1}^{\infty} \frac{e^{-n^2 x}}{n}$?

sequences-and-series riemann-zeta exponential-sum polylogarithm

answered 1 hour ago Yuriy S 18.2k

2

votes

1

answer

28

views

how to prove the convexity of the real part of this formula

convex-analysis convex-optimization computational-mathematics

answered 1 hour ago Austin 11

3

votes

1

answer

107

views

Irreducible components of $x_1x_4 -x_2x_3 = x_1x_3 - x_2^2=0$

algebraic-geometry commutative-algebra

modified 1 hour ago Hagen Knaf 7,067

5

votes

1

answer

1k

views

Riemann tensor symmetries

differential-geometry general-relativity

modified 1 hour ago Community♦ 1

0

votes

0

answers

13

views

How many space divisions by regular convex polygon?

geometry

asked 1 hour ago user366725 411

0

votes

0

answers

22

views

On inverse trigonometric functions

inverse-function

asked 1 hour ago Schwarz Kugelblitz 6

0

votes

2

answers

22

views

Is it okay to take basis from rref matrix as well as original matrix in both column space and row space?

linear-algebra matrices vector-spaces

answered 1 hour ago Shahab 4,893

0

votes

0

answers

12

views

Solving for partial derivatives but proving that function is not differentiable

multivariable-calculus derivatives

asked 1 hour ago avatar-korra 8

0

votes

0

answers

11

views

Kramers-Kronig for functions $\Bbb R^3\to\Bbb C^3$?

complex-analysis vector-analysis complex-integration cauchy-integral-formula

asked 1 hour ago Rudi_Birnbaum 637

3

votes

2

answers

68

views

Simple/elementary explanation for $\mathbf{3} \otimes \mathbf{\bar{3}} = \mathbf{8} \oplus \mathbf{1}$?

representation-theory lie-groups physics mathematical-physics

modified 1 hour ago celtschk 31.4k

6

votes

2

answers

104

views

Category of multisets

category-theory multisets

answered 1 hour ago Pece 8,755

1

vote

1

answer

26

views

Free algebra implies free module

commutative-algebra

answered 2 hours ago Es.Ro 1,115

0

votes

0

answers

16

views

Solve set of linear equations subject to sign of results

linear-algebra

asked 2 hours ago acdr 135

2

votes

0

answers

22

views

Properties of Pauli Matrices

matrices

asked 2 hours ago rodger_kicks 159

1

vote

1

answer

15

views

Create a Matrix in RREF with indeterminates in Sage

linear-algebra matrices sagemath

answered 2 hours ago Ricardo Buring 2,205

0

votes

0

answers

29

views

Determining the convergence/divergence of recursive sequence

real-analysis calculus sequences-and-series

modified 2 hours ago Jneven 1,304

1

vote

1

answer

22

views

Probability (through combinations with replacement method)

probability-theory

answered 2 hours ago JMoravitz 52.7k

-1

votes

2

answers

27

views

Proof By Contradiction logical argument

logic propositional-calculus

modified 2 hours ago lemontree 2,680

0

votes

0

answers

15

views

Conic Envelope of a Double Line Conic

conic-sections projective-geometry

asked 2 hours ago Shurik Goyal 43

1

vote

0

answers

16

views

expectation of upper quantile proportion

statistics conditional-expectation order-statistics quantile

modified 2 hours ago Amit Portnoy 106

1

vote

1

answer

27

views

How to prove that $\log(d) , d \sim U(a,b)$ is exponentially distributed (PDF)?

probability

modified 2 hours ago Jneven 1,304

1

vote

1

answer

13

views

necessity of semi finiteness

real-analysis measure-theory

modified 2 hours ago David C. Ullrich 66.2k

0

votes

1

answer

1k

views

Mappings from the z plane into the w plane

complex-analysis

modified 2 hours ago Community♦ 1

0

votes

0

answers

15

views

Find maximal flow with even flow on every edge.

network-flow

asked 2 hours ago Tamir Shalev 53

0

votes

0

answers

10

views

Expectation of the sum of logarithmic Chi-squared variables

logarithms distribution-theory expected-value chi-squared

asked 2 hours ago DrIbraComms 3

0

votes

1

answer

26

views

Eigenvalues for fingerprint classification

linear-algebra eigenvalues-eigenvectors

modified 2 hours ago Qi Zhu 2,026

2

votes

1

answer

29

views

Proposition 24 of Euclid's first book

euclidean-geometry

answered 3 hours ago Toby Mak 4,755

3

votes

4

answers

36

views

Asymptotes of hyperbola by considering x tends to infinity

conic-sections

answered 3 hours ago David K 59k

1

vote

0

answers

19

views

Is it possible to classify a PDE using the method of characteristics?

pde transport-equation

asked 3 hours ago Anton Kovalyov 6

0

votes

0

answers

16

views

Maximum distance between a point and a convex polygon as a function of its perimeter

geometry euclidean-geometry plane-geometry polygons convex-geometry

modified 3 hours ago mathcounterexamples.net 28.2k

0

votes

4

answers

149

views

Indefinite integrals

calculus integration indefinite-integrals

modified 3 hours ago Lucian 42k

3

votes

0

answers

15

views

Asymptotic map on Seiberg-Witten moduli space on manifold with cylindrical end

differential-geometry gauge-theory

asked 3 hours ago Euniceyuenyuen 16

0

votes

0

answers

16

views

Bounds on $P(Y, X)$ with $P(Y)$ and $P(X)$ known, as well as $X \geq Y$

probability-distributions

modified 3 hours ago Julian Schuessler 101

2

votes

0

answers

29

views

Given two quadratic forms, find an isometry

linear-algebra quadratic-forms isometry

asked 3 hours ago Kierkhoffen 11

4

votes

1

answer

31

views

Three questions about geometric vectors

geometry vectors euclidean-geometry analytic-geometry

modified 3 hours ago Allawonder 4,144

1

vote

0

answers

24

views

Solution of second order difference equation with non constant coefficient

recurrence-relations

modified 3 hours ago Matti P. 3,061

1

vote

0

answers

13

views

The associated graded ring of the localization $k[x_1,\cdots,x_n]_{(x_1,\cdots,x_n)}$

abstract-algebra commutative-algebra dimension-theory

modified 4 hours ago Aolong Li 1,013

1

vote

1

answer

28

views

Find all local extremum of $f = x^2 + y^2$ on the set $g = y^4 - y^6 - 3 (x^2 + x^4) = 0 $

analysis multivariable-calculus optimization lagrange-multiplier

modified 4 hours ago agababibu 687

3

votes

0

answers

26

views

Marbles of different colors in a row.

combinatorics

asked 5 hours ago Superman_1960 38

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