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Revival

Answer more than 30 days after a question was asked as first answer scoring 2 or more. This badge can be awarded multiple times.

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Notation meaning when a matrix is equal to a vector

Awarded 9 hours ago

Anakhand

2,81219 silver badges33 bronze badges

If You Go Fishing Everyday - What Is The Probability You Know X% Of The Pond?

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David

3166 bronze badges

Proposition III.3.1 in Silverman's The Arithmetic of Elliptic Curves

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Watson

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Is the quotient $\Bbb{Z}[X]/(f)$ finitely generated as an abelian group only if $f$ is monic?

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Eric Wofsey

334k28 gold badges448 silver badges667 bronze badges

A question about systems of nonlinear equations

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Hugh Thomas

1,4798 silver badges13 bronze badges

Different approach to the sum $\sum_{n=0}^{\infty}\frac{(4n)!}{n!^4} \frac{1}{4^{4n}}$

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Username_qs

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Prove that the upper half plane of Cartesian plane is not an affine variety

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mathemusician

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Finite range of a map $\rho: \mathbb{Z} \rightarrow \mathbb{Z}$

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Brian M. Scott

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Proof about intersection of three cubic curves

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Ajin Shaji Jose

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What is an eigenmatrix and what is its use?

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Ivo Tebexreni

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What exactly is a Collatz-like Problem

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gnasher729

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Delta-function representations, Bessel function

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Grigori Saiyan

212 bronze badges

A confusion regarding proof of "Every regular second countable space is normal", given in Munkres

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Cesar Corral

212 bronze badges

Cell structure of $S^2 \times S^1$

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inquisitor

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How i can prove that $\sum_{i=0}^{r+1}\binom{n-i}{r-i+1} = \binom{n}{r}$

Awarded 2 days ago

MSnts

235 bronze badges

Violation of Faithfulness in Structural Causal Models

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Manos Angelis

362 bronze badges

Criteria for $L^1$ convergence looking at Laplace transforms

Awarded Jul 17 at 8:40

Fedor Goncharov

2781 silver badge11 bronze badges

Is there some sort of property which helps to get a recursion or pattern in finding determinants for higher order cases?

Awarded Jul 16 at 20:50

TomKern

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Trotter-Kato Formula

Awarded Jul 16 at 3:53

Alex M.

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stuck on a problem regarding Finite summation and its relation to summation over finite sets Tao 7.1.11 (d)

Awarded Jul 15 at 4:08

Promethèus

5383 silver badges13 bronze badges

Why are tangent vectors in statistical manifolds $\boldsymbol e_i\approx \partial_i \log p(x,\boldsymbol\xi)$?

Awarded Jul 14 at 9:27

fmc2

1,32210 silver badges26 bronze badges

Gauss' Lemma prove $\mathbb{Z}[x]$ UFD

Awarded Jul 14 at 9:07

Arturo Magidin

405k57 gold badges833 silver badges1.1k bronze badges

Canonical processes of a stochastic process

Awarded Jul 13 at 20:48

user997881

212 bronze badges

An example of a series that is Abel-summable but not Cesàro-summable

Awarded Jul 13 at 18:57

Ѕᴀᴀᴅ

34.8k29 gold badges39 silver badges78 bronze badges

Is there an algebra of summable series?

Awarded Jul 13 at 17:41

Gottfried Helms

35k3 gold badges67 silver badges144 bronze badges

name or characterization for the “partition” lattice of integer partitions of some n? (Young lattice row partial order)

Awarded Jul 13 at 17:28

Matthieu Latapy

7613 silver badges16 bronze badges

A certain inverse limit

Awarded Jul 13 at 11:05

Enguerrand Moulinier

563 bronze badges

Easy derivation to show that the curvature is $k(t)=\frac{|\alpha'\wedge\alpha''|}{{|\alpha'|}^3}$?

Awarded Jul 13 at 5:52

Ricardo Gloria

416 bronze badges

Is there a way to solve quintics of the form $ax^5+bx^4+c=0$?

Awarded Jul 12 at 17:05

K Z Nobrega

4691 silver badge10 bronze badges

Studying modal logic using category theory

Awarded Jul 12 at 12:37

Rodrigo Nicolau Almeida

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A bound for the expectation of the maximum independent random variables

Awarded Jul 12 at 8:50

Rana

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Does Hennessy-Milner Theorem hold when I weaken its condition (image-finite) a little?

Awarded Jul 12 at 8:08

BAD MAN

437 bronze badges

$VN^{\infty}$ as an example of a quantum group

Awarded Jul 12 at 7:21

MaoWao

15.5k1 gold badge19 silver badges40 bronze badges

Plot Cayley graphs for generic element groups

Awarded Jul 12 at 0:33

Charlotte Aten

1818 bronze badges

Poincaré-Bendixson applied to region enclosed by homoclinic orbit

Awarded Jul 11 at 22:35

Á. Nágel

214 bronze badges

Number of points of non-differentiabilty of $f(x)=(\arccos x)|\sin (kx)|$

Awarded Jul 11 at 20:33

Sounak

916 bronze badges

Computing the integral $ \int_0^{\infty} e^{-\phi^2+\phi}\cdot \phi^{2} \ln(1-2x\cos\phi+x^2)\, d\phi. $

Awarded Jul 11 at 17:06

Claude Leibovici

268k53 gold badges119 silver badges263 bronze badges

In a closed monoidal category $\mathcal{V}$ is the adjunction $\mathcal{V}$-natural?

Awarded Jul 11 at 15:17

varkor

5,93816 silver badges31 bronze badges

This (rather long) implicit equation has a short explicit solution, but how can it be found?

Awarded Jul 11 at 6:13

TheSimpliFire♦

27.1k10 gold badges61 silver badges131 bronze badges

Prove Bernstein’s inequality for martingales

Awarded Jul 11 at 3:14

Efim Mazhnik

9106 silver badges13 bronze badges

Fourier series expansion of Dirac delta function

Awarded Jul 10 at 16:49

paul garrett

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Application of fix point theorem for functions $\epsilon,\delta:[0,1]\to[0,1]$

Awarded Jul 10 at 14:51

Steen82

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Hecke characters of imaginary quadratic fields

Awarded Jul 10 at 11:32

Chaitanya

1312 bronze badges

Proof of Lemma 3.49 in the Diamond-Darmon-Taylor Fermat's Last Theorem Notes

Awarded Jul 10 at 8:48

Aphelli

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What is area form?

Awarded Jul 10 at 5:15

Nostalgia

497 bronze badges

Joining or concatenating two different vectors into a one vector

Awarded Jul 9 at 23:57

40 votes

9,81637 silver badges111 bronze badges

Can derivative of Hurwitz Zeta be expressed in Hurwitz Zeta?

Awarded Jul 9 at 22:24

wythagoras

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Natural transformation = parametric polymorphic function in “structure categories”?

Awarded Jul 9 at 19:51

Qiaochu Yuan

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Fibonacci and Lucas numbers related identities

Awarded Jul 9 at 18:54

R. J. Mathar

3,2735 silver badges9 bronze badges

How to make the largest square possible from smaller squares

Awarded Jul 9 at 14:17

NivMan

1476 bronze badges

Relationship of powers of Phi to Lucas Numbers

Awarded Jul 9 at 13:10

R. J. Mathar

3,2735 silver badges9 bronze badges

Normalization of nodal singularity of a curve and canonical divisor.

Awarded Jul 9 at 3:37

Elk

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Computing $\int_{|z|=2} z^n(1 - z)^m\ dz$

Awarded Jul 9 at 2:33

mjw

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How to prove Helly's theorem using Nerve theorem

Awarded Jul 8 at 7:01

ronno

12.3k1 gold badge30 silver badges79 bronze badges

Estimate clan size

Awarded Jul 8 at 6:17

MosQuan

213 bronze badges

is {w in {0,1}* | #0(w) = #1(w)} a regular language?

Awarded Jul 8 at 4:36

templatetypedef

10.5k5 gold badges40 silver badges88 bronze badges

Uniqueness of smooth structures on submanifolds with boundary

Awarded Jul 7 at 11:22

Tob Ernack

4,6151 gold badge11 silver badges30 bronze badges

Evaluate this indefinite integral $\int \sin^{e}x \,dx$

Awarded Jul 7 at 10:25

Travis Willse

102k13 gold badges127 silver badges260 bronze badges

Meijer function as a product of two Meijer's functions

Awarded Jul 7 at 6:27

Okan Erturk

1718 bronze badges

When You Have Three Chicken McNugget Container Sizes

Awarded Jul 7 at 0:53

Display maths

1019 bronze badges

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