Mathematics Stack Exchange

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2

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What is parametric equation of a cylinder with an arbitrary norm in Cartesian system?

matlab parametric symbolic-computation

asked 2 mins ago Mike IT Expert 1

0

votes

0

answers

7

views

Brownian motion expectation

brownian-motion expected-value stopping-times

modified 2 mins ago GohP.iHan 975

1

vote

1

answer

24

views

Prove $\sqrt{a} \cos^2(\theta) + \sqrt{b} \sin^2(\theta) < \sqrt{c}$ if $a\cos^2(\theta) + b \sin^2(\theta) < c$

calculus inequality convex-analysis recreational-mathematics problem-solving

modified 3 mins ago mathcounterexamples.net 40.6k

0

votes

0

answers

8

views

What is the trick used for Gaussian-like or generalized Gaussian integral?

gaussian-integral

asked 3 mins ago MathArt 314

0

votes

2

answers

7

views

How to prove transitivity and antisymmetry of such Partial Order?

discrete-mathematics order-theory

answered 3 mins ago cgss 606

0

votes

0

answers

10

views

Straight lines on surfaces other than $\mathbb{S}^2$ and $\mathbb{H}$

geometry differential-geometry riemannian-geometry surfaces noneuclidean-geometry

modified 4 mins ago Blue Various 443

2

votes

1

answer

27

views

Why do engineers use derivatives in discontinuous functions? Is it correct?

calculus functions derivatives optimization

modified 1 min ago Sebastiano 2,532

0

votes

2

answers

11

views

Probability question on sample space and events

probability probability-theory

answered 4 mins ago herb steinberg 6,838

0

votes

0

answers

5

views

A type of Holder function

real-analysis sobolev-spaces holder-spaces

asked 5 mins ago Aldo 95

2

votes

3

answers

26

views

If $f(x)>0$ is increasing and $g(x)>0$ is decreasing, then, is it clear if $f(x)g(x)$ is increasing or decreasing?

functions monotone-functions

answered 5 mins ago IamWill 2,429

2

votes

2

answers

55

views

Elementary Relations/Functions and the Solvability of their Inverses

real-analysis algebra-precalculus functions elementary-functions

modified 6 mins ago IV_ 2,700

1

vote

1

answer

25

views

When does the quadratic form of an operator assume non-negative values?

linear-algebra functional-analysis eigenvalues-eigenvectors operator-theory hilbert-spaces

modified 6 mins ago Martin Argerami 155k

3

votes

2

answers

49

views

finding bounds for $\int_0^X\lfloor x^2\rfloor \, dx$

integration ceiling-and-floor-functions upper-lower-bounds

modified 6 mins ago Oldboy 14.1k

0

votes

0

answers

6

views

What website is goood for finding a value of x for any value of n?

mixing-variables

asked 7 mins ago Jules 101

0

votes

1

answer

25

views

Evaluate $\frac{\int_{0}^{\infty}(1+x^2)^{-2012}dx}{\int_{0}^{\infty}(1+x^2)^{-2011}dx}$

integration solution-verification recursion reduction-formula

answered 7 mins ago Bernard 154k

0

votes

0

answers

8

views

Axiom in Steven Lay's Book on Real Analysis

real-analysis

asked 7 mins ago Math101 582

2

votes

0

answers

11

views

Is commutativity needed in the proof of division algorithm?

abstract-algebra polynomials ring-theory

asked 8 mins ago LAD 6,457

0

votes

1

answer

17

views

Epsilon delta proof, choosing inequality side

epsilon-delta

answered 9 mins ago azifmedrano 10.3k

1

vote

1

answer

9

views

About transcendence degree of an affine $K$-domain

commutative-algebra transcendence-degree

answered 10 mins ago Qiaochu Yuan 311k

2

votes

1

answer

18

views

Is this a good intuition for the general approach to solving non-trivial differential equations?

abstract-algebra functional-analysis ordinary-differential-equations polynomials intuition

answered 10 mins ago K.defaoite 3,096

0

votes

1

answer

26

views

Hard trigonometry problem

trigonometry

answered 12 mins ago Ale Tolcachier 1,495

1

vote

0

answers

23

views

The cyclotomic polynomial analogue for $A_n$.

abstract-algebra group-theory galois-theory algebraic-number-theory symmetric-groups

modified 13 mins ago ReverseFlow 760

1

vote

1

answer

27

views

Ricci flow symmetry paradox

differential-geometry differential-topology riemannian-geometry ricci-flow

modified 14 mins ago Kajelad 5,014

0

votes

0

answers

3

views

How to update a distribution by using joint distribution of its function values?

probability-distributions bayesian estimation

asked 15 mins ago Ahmet Anıl Dursun 1

2

votes

0

answers

21

views

Group $G$ of order $24$ that is either $S_4$ or $G/Z(G)$ is $A_4$.

group-theory sylow-theory

modified 16 mins ago Ale Tolcachier 1,495

2

votes

0

answers

21

views

If $G$ is a finite group, $p$ is a prime such that $p\big||G|$ and $n_p$ is the number of Sylow $p$-subgroups of $G$, then $|Aut(G)|\leq |S_{n_p}|$.

group-theory symmetric-groups group-actions sylow-theory automorphism-group

modified 17 mins ago Arturo Magidin 308k

0

votes

1

answer

8

views

Finite moment for normed sum implies finite moments for the norms of individual terms.

real-analysis probability probability-theory

answered 18 mins ago WoolierThanThou 9,512

1

vote

1

answer

16

views

Stuck on this definite integration problem

calculus integration definite-integrals

answered 19 mins ago Ty. 4,307

0

votes

0

answers

16

views

How to find the imaginary part of $\exp\left(-bR^2\,_2F_1\left(1,2/a;1+2/a,\dfrac{R^a}{it}\right)-ict\right)$?

complex-analysis complex-numbers

modified 23 mins ago cmk 8,957

0

votes

0

answers

6

views

Question related to asymptotic equivalence and possibly regularly varying functions

real-analysis asymptotics slowly-varying-functions

asked 25 mins ago MATH101 77

1

vote

0

answers

9

views

Ring of invariant of finite groups and its subgroups

invariant-theory

asked 25 mins ago Nguyen Dang Son 70

-1

votes

0

answers

18

views

How do I find the volume of a bounded elliptic paraboloid?

integration volume multiple-integral

modified 26 mins ago Andrés Morales 57

0

votes

0

answers

19

views

Find number of relations R that are onto

combinatorics relations

modified 29 mins ago Andrés E. Caicedo 71.4k

1

vote

1

answer

23

views

Deciphering graph theory statement/notation.

graph-theory notation directed-graphs

modified 32 mins ago Especially Lime 30.1k

0

votes

0

answers

6

views

Proving convergence for a two-dimensional integral that cannot be solved

convergence-divergence improper-integrals

asked 35 mins ago Zach Jacobs 1

0

votes

0

answers

8

views

Inequality for positive real numbers

inequality contest-math

asked 38 mins ago Anderson Torres 31

2

votes

1

answer

28

views

Alternatives way to evaluate$ \int_0^1 x^{2n-1}\ln(1+x)dx =\frac{H_{2n}-H_n}{2n}$

definite-integrals alternative-proof harmonic-numbers

modified 38 mins ago Bernard 154k

1

vote

1

answer

39

views

Sine of sum proof

trigonometry alternative-proof

modified 38 mins ago Sebastiano 2,532

0

votes

0

answers

16

views

Definition about convergence of a sequence in $\mathbb{R}^n$

general-topology vector-analysis

modified 39 mins ago Daniel 1,309

2

votes

0

answers

7

views

Any idea to prove that $\coth (x)-(1-y) \coth [x (1-y)]<\frac{4 x}{1-x^4}$?

inequality alternative-proof

asked 39 mins ago katy98 287

1

vote

0

answers

8

views

Is there a differentiable smooth max and min function that respects the distributive law?

derivatives optimization maxima-minima smooth-functions

modified 40 mins ago Kevin 11

0

votes

0

answers

28

views

Weyl group orbit of a dominant weight

combinatorics representation-theory lie-groups lie-algebras

modified 41 mins ago jack lingre 1

2

votes

1

answer

35

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Representing second homology by embedded spheres

algebraic-topology differential-topology

answered 41 mins ago John Hughes 78.8k

0

votes

0

answers

16

views

Label a random variable using an i.i.d

group-theory measure-theory ergodic-theory

asked 42 mins ago Mariah 3,576

0

votes

0

answers

18

views

A Possibly Divergent Improper Integral

calculus integration definite-integrals improper-integrals

asked 45 mins ago qsazd 1

2

votes

1

answer

61

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Show that $\bigg(\dfrac{a+1}{b+1}\bigg)^{b+1}>\bigg(\dfrac{a}{b}\bigg)^{b}$ for $a,b>0$ and $a \not=b$.

calculus inequality recreational-mathematics

answered 48 mins ago Angelo 1,662

0

votes

1

answer

18

views

Compute the following integral (moments and the log normal distribution).

calculus integration probability-theory

answered 50 mins ago openspace 5,646

0

votes

0

answers

29

views

How to best show that $f(a)$ is the greatest element of $f[A]$

order-theory

modified 1 hour ago Ale Tolcachier 1,495

0

votes

1

answer

19

views

Prove that the following estimator is unbiased.

statistics parameter-estimation

answered 1 hour ago openspace 5,646

1

vote

1

answer

33

views

Tightness of bound on true risk in the simplest optimistic case

probability statistics machine-learning

answered 1 hour ago MONODA43 468

1

vote

1

answer

28

views

prove the angle of sum of vectors is always in the middle

geometry vectors

answered 1 hour ago Carl Schildkraut 16.6k

0

votes

1

answer

116

views

Tossing a coin $n$ times, probability for a palindrome?

probability palindrome

modified 1 hour ago Vepir 9,270

0

votes

0

answers

6

views

Explicit formula for the curvature of line passing through two given points in Poincare disk model.

hyperbolic-geometry

asked 1 hour ago user2554 291

1

vote

1

answer

75

views

Is there a Mobius palindrome?

elementary-number-theory mobius-function palindrome

modified 1 hour ago Vepir 9,270

0

votes

0

answers

18

views

Determining the areas above, below, and between two cumulative distributions

integration area cumulative-distribution-functions

modified 1 hour ago Jamie 1

0

votes

0

answers

6

views

Characterization of a cyclonic force field as “emerging from the origin at a constant rate and flowing uniformly in all directions”.

multivariable-calculus

modified 1 hour ago Mars 202

1

vote

3

answers

234

views

expected value of a random palindrome

probability palindrome

modified 1 hour ago Vepir 9,270

0

votes

0

answers

25

views

How do I know that a plot of a function is correct?

algebra-precalculus graphing-functions philosophy

modified 1 hour ago J. W. Tanner 43.8k

3

votes

1

answer

317

views

Dynamic Programming problem palindrome

algorithms problem-solving recursive-algorithms dynamic-programming palindrome

modified 1 hour ago Vepir 9,270

2

votes

0

answers

278

views

Sum of two palindromes to a different base equals a third palindrome to a different base

elementary-number-theory recreational-mathematics number-systems palindrome

modified 1 hour ago Vepir 9,270

0

votes

0

answers

4

views

Dynamics of horocycle flow in modular surface connected to Riemann Hypothesis

reference-request dynamical-systems online-resources riemann-hypothesis modular-group

asked 1 hour ago geocalc33 1,143

1

vote

3

answers

696

views

Is Pi - π a palindrome?

irrational-numbers pi palindrome

modified 1 hour ago Vepir 9,270

1

vote

1

answer

90

views

Is there another palindrome-Carmichael-number?

number-theory prime-numbers pseudoprimes palindrome

modified 1 hour ago Vepir 9,270

1

vote

1

answer

23

views

We have n identical objects , and we want to distribute them to 3 different children A, B, C.

combinatorics discrete-mathematics

modified 1 hour ago N. F. Taussig 55.8k

4

votes

0

answers

294

views

Binary Palindrome

algorithms palindrome

modified 1 hour ago Vepir 9,270

0

votes

0

answers

4

views

Finding a subset of fixed size of a graphs vertex set that minimizes 'surface area'. AKA finding min cut for fixed partition size.

graph-theory

asked 1 hour ago mathew 1,372

0

votes

0

answers

11

views

Apply Dvoretzy-Kiefer-Wolfowitz inequality to 2D problem

probability probability-theory inequality

asked 1 hour ago MONODA43 468

4

votes

1

answer

39

views

Are there always multiple scalar multiplications over non-prime fields?

linear-algebra abstract-algebra field-theory

answered 1 hour ago Qiaochu Yuan 311k

0

votes

0

answers

8

views

Is it possible to define a function that appears undefined if it is derived from a function that is defined?

calculus limits

asked 1 hour ago financial_physician 289

0

votes

1

answer

36

views

Sufficiency of Lebesgue's Criterion for Riemann Integrability

real-analysis proof-explanation lebesgue-measure riemann-integration

modified 1 hour ago Alphie 819

0

votes

0

answers

16

views

What is the derivative of this integral with a pdf

calculus integration

modified 1 hour ago ELLA 59

0

votes

0

answers

7

views

Basis vectors for Heisenberg AlgebraDifference between quasi-bialgebra and bialgebra?

abstract-algebra category-theory

asked 1 hour ago HaKuNa MaTaTa 5,227

0

votes

1

answer

928

views

Smooth Curve Definition

smooth-manifolds curves

modified 1 hour ago Community♦ 1

0

votes

0

answers

25

views

How can I enumerate the transformation rules on lists of lists?

algorithms pattern-matching

modified 1 hour ago zooby 3,347

1

vote

1

answer

12

views

Decomposition of semisimple Lie groups (lie algebras) into direct products (direct sums) and the correspondence.

lie-groups lie-algebras

answered 1 hour ago Qiaochu Yuan 311k

0

votes

0

answers

12

views

Mixed-Marble Mayhem

combinatorics

asked 1 hour ago Alex Wang 11

2

votes

0

answers

27

views

Bolyai's parallel angle formula？

geometry surfaces hyperbolic-geometry noneuclidean-geometry

modified 1 hour ago Blue Various 443

0

votes

1

answer

13

views

Narrow equals wide topology on probability measures: reference?

measure-theory weak-convergence

answered 1 hour ago snar 6,259

1

vote

0

answers

33

views

Is it OK to refer results to Encyclopedia of Mathematics?

reference-works

asked 1 hour ago user3810316 317

1

vote

1

answer

26

views

Equation of a circle with two points and tangent to a circle

geometry circles

answered 2 hours ago GReyes 7,068

0

votes

1

answer

14

views

function of series after integral

real-analysis power-series

answered 2 hours ago openspace 5,646

1

vote

0

answers

11

views

What is the Bergman kernel for upper half-space?

several-complex-variables

asked 2 hours ago Ramin Barati 11

0

votes

0

answers

11

views

When can every set in a monotone class $\mathcal{M}(\mathcal{C})$ be written as a countable monotone union or intersection of sets in $\mathcal{C}$?

measure-theory

asked 2 hours ago TheProofIsTrivium 817

2

votes

1

answer

10

views

Radon measure is inner regular if and only if it is semi-finite

measure-theory

answered 2 hours ago Sebastian Spindler 249

1

vote

0

answers

28

views

Proving that integral is larger than Wasserstein metric

probability-theory measure-theory inequality optimal-transport

modified 2 hours ago Davi Barreira 1,056

1

vote

0

answers

8

views

Convex surfaces in semi-Riemannian manifolds?

semi-riemannian-geometry

asked 2 hours ago Faster Dam 43

0

votes

0

answers

10

views

How to identify the upper and lower surfaces while calculating the volume bound by two given planes?

calculus definite-integrals 3d volume multiple-integral

modified 2 hours ago Integrand 6,504

0

votes

2

answers

25

views

why $\int_{-\pi}^{\pi}f_n(t)^p$ is not zero on $L^p[-\pi,\pi]$

lp-spaces

answered 2 hours ago herb steinberg 6,838

2

votes

0

answers

28

views

Prove almost sure convergence for log series

probability-theory convergence-divergence probability-limit-theorems

modified 3 hours ago StubbornAtom 11.9k

2

votes

0

answers

28

views

example of a simple Galois extension over $\mathbb{Q}$

abstract-algebra galois-theory extension-field galois-extensions

modified 3 hours ago JCAA 7,583

0

votes

0

answers

7

views

Equation of a hyperbolic slot

linear-algebra

asked 3 hours ago Sabri 1

0

votes

0

answers

33

views

Is my understanding of how not to use the ($\rightarrow$ Introduction) rule correct?

discrete-mathematics logic propositional-calculus natural-deduction

asked 3 hours ago 0implies0 45

0

votes

0

answers

6

views

Maximum likelihood estimation for beta distribution

optimization maximum-likelihood hessian-matrix

asked 3 hours ago Emin Ozkan 125

2

votes

0

answers

17

views

Conservation law for the Camssa-Holm equation

partial-differential-equations

asked 3 hours ago Neldrock 145

0

votes

4

answers

46

views

What is a permutation and how it works.

permutations permutation-cycles

answered 3 hours ago IamWill 2,429

6

votes

0

answers

252

views

Square-integrability in lemma 4.30 of Folland's “A Course in Abstract Harmonic Analysis”

measure-theory proof-explanation lp-spaces harmonic-analysis

modified 3 hours ago julian 1,614

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