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Community Bot

modified 29 mins ago

0 votes

1 answer

24 views

Need a conclusive example that explains why QBF Prenex Transformations require closed QBF formulas

Anne Bauval

51.2k

answered 38 mins ago

1 vote

0 answers

60 views

+100

What makes the category of isocrystals over non-algebraically closed field non-semisimple?

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François Gatine

3,027

modified 50 mins ago

0 votes

0 answers

13 views

How to extend series coefficient for negative coefficients?

calculus

John C's user avatar

John C

modified 57 mins ago

0 votes

1 answer

45 views

Why do we find the arc length when given an angle in degrees the way we do?

circles

Robert Israel's user avatar

Robert Israel

473k

Robert Israel's user avatar

0 votes

0 answers

10 views

Hankel Contour: Are Residues Counted or Excluded?

ftel's user avatar

ftel

asked 1 hour ago

1 vote

2 answers

180 views

Find all functions $f : \mathbb R \to \mathbb R$ such that: $𝑓 (𝑥 𝑓 ( 𝑦 ))+𝑦 𝑓 ( 𝑥) = 𝑥 𝑓 ( 𝑦 ) + 𝑓 ( 𝑥𝑦 ),$ $∀\ 𝑥 , 𝑦 \in \mathbb{R}$

Robert Israel

473k

14 votes

1 answer

805 views

zeros/poles of Laplace transforms of Dirac combs (Riemann zeta function)

Community Bot

van der Wolf's user avatar

3 votes

1 answer

69 views

Martingales convergence a.s.

van der Wolf

6,223

0 votes

2 answers

117 views

Use Laplace transforms to solve the integral equation.

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RobPratt

52.3k

coconuthead's user avatar

2 votes

2 answers

59 views

Why is $W_2(\hat{A})$ derived $I$-complete?

coconuthead

2 votes

3 answers

160 views

Evaluate $\int_0^{\frac\pi2} \frac{1}{a \sin ^2x+b \cos ^2x} ,円 \mathrm dx$

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xpaul

49.4k

Simone Coppola's user avatar

0 votes

1 answer

40 views

If 2 recursion relation has the same coeficients are the solution proportional?

Simone Coppola

1 vote

1 answer

69 views

The set of positive $(x,y,z)$ such that $x^{n_1}+y^{n_2}=z^{n_3}$ for positive integers $n_i$ is dense in the set $[1,\infty)^3$

hbghlyj's user avatar

hbghlyj

6,019

David G. Stork's user avatar

0 votes

0 answers

11 views

Doob's maximal inequality proof

stochastic-analysis

mikasa's user avatar

mikasa

asked 2 hours ago

1 vote

1 answer

55 views

Resultant bounded by norms

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DonTelmare

answered 2 hours ago

2 votes

1 answer

779 views

A game with coin toss

game-theory

David G. Stork

30.6k

Lourenco Entrudo's user avatar

1 vote

0 answers

179 views

Null and Range Projections

Lourenco Entrudo

2,354

Bruno Andrades's user avatar

4 votes

2 answers

2k views

Show that the Levy distance is a metric

Bruno Andrades

5,334

answered 2 hours ago

-1 votes

0 answers

134 views

How many independent branches proofs of Euler's formula are there?

complex-numbers

Kenay5 55's user avatar

Kenay5 55

Avel Bulatov's user avatar

3 votes

0 answers

171 views

Name of the algebraic structure

Avel Bulatov

modified 3 hours ago

2 votes

1 answer

52 views

Winnability of an urn-ball game with restricted two-urn moves

mihaild's user avatar

mihaild

answered 3 hours ago

2 votes

1 answer

46 views

Representations of a separable Hilbert space as a Banach lattice

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Tomasz Kania

17.1k

answered 3 hours ago

0 votes

4 answers

161 views

if $f$ is holomorphic and $f(z)=f(\overline{z})$ then $f$ is constant

complex-analysis

Stardust's user avatar

Stardust

answered 4 hours ago

1 vote

0 answers

48 views

Help: Proof of Ptolemy's Inequality with Complex Numbers

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mkcW

asked 4 hours ago

4 votes

1 answer

139 views

if $x^2+1$ is a powerful number then $x=682$?

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Bill Dubuque

285k

Eli Bartlett's user avatar

6 votes

0 answers

52 views

Does the polylogarithm $\mathrm{Li}_k(x)$ solve a first or second order ODE/ADE?

Eli Bartlett

2,456

Bill Dubuque's user avatar

1 vote

2 answers

1k views

Prove $(p-2)! \equiv 1\pmod p\ $ (equivalent to Wilson's Theorem).

Bill Dubuque

285k

4 votes

1 answer

773 views

Mean value of the rotation angle is 126.5°

Community Bot

2 votes

1 answer

77 views

Showing $\sum\limits_{i,j=1}^{n} t^{-a_ia_j} \geq \sum\limits_{i,j=1}^{n} t^{a_ia_j},ドル for $t\in(0,1)$ and $a_i\in(-1,1)$

inequality

Martin R's user avatar

Martin R

133k

Atharv Rege's user avatar

0 votes

2 answers

34 views

Find the length of the side DQ

Atharv Rege

2 votes

0 answers

646 views

Does ternary operations have associative property?

binary-operations

MaoWao

16.6k

2 votes

1 answer

430 views

Conditional expectation on the space of bounded linear operators

Sangchul Lee's user avatar

MaoWao

16.6k

answered 5 hours ago

1 vote

1 answer

74 views

Help in filling in the gaps from a contour integration in QFT

Sangchul Lee

185k

5 votes

1 answer

4k views

Fourier transform of $\frac{1}{r}$ (Coulomb potential)

Community Bot

1 vote

0 answers

47 views

Algebra structure on Haagerup Tensor Product of Operator Spaces

MaoWao

16.6k

0 votes

2 answers

50 views

Perpendiculars passing through diagonal intersection in a quadrilateral formed within a square

jjagmath's user avatar

jjagmath

24.6k

answered 5 hours ago

2 votes

1 answer

155 views

tensor product of $C^*$-algebras.

MaoWao

16.6k

answered 5 hours ago

0 votes

0 answers

38 views

Solutions of a non-linear system

byk7's user avatar

byk7

asked 5 hours ago

2 votes

1 answer

60 views

Convergence of certain sequence in a $C^*$ algebra

J. W. Tanner's user avatar

MaoWao

16.6k

answered 6 hours ago

0 votes

0 answers

70 views

Is there still active research in the mathematical theory of distributions?

J. W. Tanner

64.5k

10 votes

5 answers

1k views

Why Is the Dual Basis Mathematically Unavoidable?

Man-I-Fold's user avatar

Man-I-Fold

0 votes

1 answer

772 views

Equation of a bounded plane in 3D

Community Bot

24 votes

6 answers

1k views

Why is this angle always less than 49ドル°$?

dfnu's user avatar

dfnu

8,388

1 vote

0 answers

32 views

Scheme over base field $k$ which is algebraically (resp. separably) closed in ring of regular functions of $X$

user267839's user avatar

user267839

anonymousclassjava's user avatar

8 votes

1 answer

308 views

$\frac{G_1\times G_2}{N_1\times N_2}\cong \bigg(\frac{G_1}{N_1}\bigg)\times \bigg(\frac{G_2}{N_2}\bigg)$

anonymousclassjava

0 votes

0 answers

15 views

Proving the solution of heat equation is $C^2_1(\mathcal R^n \times (0,\infty))$

HIH's user avatar

HIH

pedrostrujillo's user avatar

1 vote

0 answers

34 views

When does $\int_0^{1/2} f(x) \ dx= \int_0^1 f(\varphi(x)),円v(x) \ dx$ hold for $\varphi(t)=\min\{t,1-t\}$?

pedrostrujillo

Sangchul Lee's user avatar

0 votes

2 answers

59 views

Absolute convergence and rearrangements

Paul Frost's user avatar

Paul Frost

92.1k

answered 7 hours ago

4 votes

1 answer

187 views

Prove that $\int_0^1\operatorname{Li}_2\left(\frac{1-x^2}{4}\right)\frac{2}{3+x^2},円\mathrm dx= \frac{\pi^3 \sqrt{3}}{486}$

Sangchul Lee

185k

modified 7 hours ago

1 vote

1 answer

54 views

Description of the ideals of $A[X]$ using stationary chains of ideals of $A$

Aniruda Suswaram's user avatar

Aniruda Suswaram

modified 7 hours ago

0 votes

1 answer

822 views

A problem on triangle and its perpendicular bisectors.

MathPatterns's user avatar

Community Bot

modified 7 hours ago

2 votes

1 answer

129 views

Why does the Generalized Collatz map (3ドルn+k$) with $k=3^x+2^x$ produce 1,023 cycles at $x=15,ドル but collapse to 1 cycle for $x \ge 21$?

MathPatterns

answered 7 hours ago

3 votes

3 answers

172 views

Find all real solutions $(x_1,\dots,x_n)\in\mathbb{R}^n$.

systems-of-equations

Ataulfo's user avatar

Ataulfo

33.7k

answered 8 hours ago

0 votes

2 answers

120 views

Let $P(x) \in [1,2][x]$ and $P(x) = Q(x)R(x),ドル where $Q(x)$ and $R(x)$ are nonconstant, and $Q(x)$ is monic. Prove: $|Q(3)| > 1$

Amelia Tearheart's user avatar

Amelia Tearheart

2 votes

1 answer

53 views

$f(0)=1, f(x) \ge 0 \ge f'(x), f''(x)\le f(x)$ for $x\ge 0$

T_T's user avatar

T_T

3,338

0 votes

1 answer

774 views

Are they stable or unstable limit cycles?

Community Bot

1 vote

1 answer

55 views

Reasoning behind logistic regression

logistic-regression

J.G.'s user avatar

J.G.

119k

Vladimir Lysikov's user avatar

1 vote

1 answer

46 views

Does the tensor $\Phi$ take this form?

Vladimir Lysikov

5,350

7 votes

3 answers

473 views

Frullani version of the classic $\log \left( 1 + 2\alpha \cos px + \alpha^2\right)$ integral.

xpaul's user avatar

xpaul

49.4k

answered 8 hours ago

5 votes

3 answers

4k views

What does it mean that we can diagonalize the metric tensor?

Alex M.'s user avatar

Alex M.

36.2k

modified 9 hours ago

3 votes

1 answer

163 views

Can 1,ドル \sqrt{26},5$ construct a right angle triangle?

Math12's user avatar

Math12

modified 9 hours ago

2 votes

2 answers

770 views

Ergodicity of a sequence of independent blocks

Community Bot

modified 9 hours ago

5 votes

1 answer

83 views

Center of a finite perfect group

Haran's user avatar

Haran

12.9k

answered 10 hours ago

0 votes

0 answers

24 views

Spectral decomposition of the Neumann-Laplacian

Zaza's user avatar

Zaza

asked 10 hours ago

0 votes

0 answers

24 views

Why do we need \rho (utilization)<1 in queuing theory?

AngelP's user avatar

AngelP

asked 10 hours ago

3 votes

3 answers

237 views

Analytic sum of an alternating series$\sum\limits_{n=1}^{\infty}(-1)^{n} \frac{n}{\left(n+\sqrt{a+n^2}\right)^2}$

Svyatoslav's user avatar

Svyatoslav

21.5k

0 votes

1 answer

53 views

Admissible test functions for weak formulation of Neumann problem

K.defaoite's user avatar

K.defaoite

14.4k

3 votes

1 answer

52 views

Range of base $a$ such that $f(x) = a^x - bx + e^2$ has two distinct zeros for all $b > 2e^2$

Bowei Tang's user avatar

Bowei Tang

4,563

answered 10 hours ago

2 votes

1 answer

80 views

Angle between tangents of a hyperbola

JHT's user avatar

JHT

Tankut Beygu's user avatar

1 vote

1 answer

235 views

Prove ($p \Rightarrow q) \land (q \equiv r) \Rightarrow (p\Rightarrow r)$ in Gries and Schneider, Exercise 3.71 (equational proof)

Tankut Beygu

4,891

answered 10 hours ago

29 votes

2 answers

3k views

Sum equals the product

Bruno Andrades's user avatar

Bruno Andrades

5,334

joão cabral's user avatar

2 votes

1 answer

79 views

Why is fact that the determinant of this matrix is 0 equivalent to $x'^T Fx=0$

joão cabral

modified 11 hours ago

2 votes

0 answers

49 views

Every k-fold cover of the real line by intervals can be decomposed into k distinct covers.

Paul Frost's user avatar

Paul Frost

92.1k

modified 12 hours ago

1 vote

0 answers

38 views

Is consistency a symmetric relation?

modal-logic

LuBi's user avatar

LuBi

asked 12 hours ago

1 vote

0 answers

66 views

Definite integral of the two Bessel functions / (x-a)

Gary's user avatar

Gary

37.3k

modified 12 hours ago

6 votes

1 answer

2k views

Question about Proof of Merten's theorem (Cauchy-Product formula)

Firdous Ahmad Mala's user avatar

Firdous Ahmad Mala

3,613

modified 12 hours ago

0 votes

0 answers

13 views

Verifying One-vs-All Precision and Recall calculations from a multi-class confusion matrix

Minesota's user avatar

Minesota

asked 13 hours ago

1 vote

0 answers

38 views

Fourier inversion theorem for compact groups

Maxi Müller's user avatar

Maxi Müller

modified 13 hours ago

12 votes

4 answers

782 views

Closed form solution for $ \int\limits_{0}^{1} x^{x} (1-x)^{1-x} dx $

Dhairya Kumar's user avatar

Dhairya Kumar

modified 14 hours ago

7 votes

0 answers

381 views

How to evaluate $\int\limits_{0}^{\frac{\pi}{2}}x^3(\sqrt{\tan x}-\sqrt{\cot x}) dx$?

Dhairya Kumar's user avatar

Dhairya Kumar

modified 14 hours ago

6 votes

0 answers

240 views

Finding a closed form for $\int\limits_{0}^{1} \frac{1}{x} \ln\left(\frac{\ln\left(\frac{1-x}{2}\right)}{\ln\left(\frac{x+1}{2}\right)}\right)\ dx$

Dhairya Kumar's user avatar

Dhairya Kumar

modified 14 hours ago

0 votes

1 answer

1k views

Scheduling: Moore's algorithm