Self-Learner - Badge - Mathematics Stack Exchange

Self-Learner

Answer your own question with score of 3 or more.

Awarded 4097 times.

Dedekind-infinite vs weakly Dedekind-infinite in ZF

Awarded 19 hours ago

user308485

1,2797 silver badges14 bronze badges

Concatenation of $f$-related vector fields/tangent vectors

Awarded yesterday

welahi

2831 silver badge8 bronze badges

Natural transformations of Hom-sets “transport” natural transformations from one pair of functors to another? (Reference)

Awarded 2 days ago

hasManyStupidQuestions

1,3661 gold badge7 silver badges18 bronze badges

Prove that if $\forall n\in\Bbb N\quad a_{n+1}^2-a_{n+1}=a_n\in\Bbb Q$, then the sequence is constant

Awarded Apr 12 at 18:06

Anne Bauval

35.3k7 gold badges28 silver badges63 bronze badges

(post deleted or otherwise unavailable)

Awarded Apr 11 at 23:03

Mike

37 bronze badges

Can you make the triviality of $\langle a,b,c \mid aba^{-1} = b^2, bcb^{-1} = c^2, cac^{-1} = a^2 \rangle$ more trivial?

Awarded Apr 11 at 10:16

Alex Kruckman

76.4k4 gold badges81 silver badges141 bronze badges

Prooving the possibilty of factor cancelation in a congruence equation

Awarded Apr 9 at 22:40

Anqa012

416 bronze badges

Ideas on how to solve a PDE with mixed derivatives

Awarded Apr 9 at 11:15

NabbKitha

5403 silver badges16 bronze badges

Maximum number of colors for embedding all colored perfect matchings in the complete graph

Awarded Apr 8 at 18:52

Matija

3,5581 gold badge4 silver badges23 bronze badges

Is it possible to realize the Klein bottle as a linear group orbit?

Awarded Apr 8 at 13:50

Ian Gershon Teixeira

8,1781 gold badge8 silver badges20 bronze badges

Calculating the truncation error for exponential function in complex plane

Awarded Apr 8 at 7:36

angrwl

3091 silver badge9 bronze badges

Multivariate chain rule (again) for differential forms

Awarded Apr 6 at 16:42

Gareth Ma

3,7374 silver badges24 bronze badges

What do the "real" and "imaginary" parts of the Laplace and Z transform represent?

Awarded Apr 6 at 10:21

Shredder

2212 silver badges5 bronze badges

Why is the Weil restriction of the multiplicative group a torus?

Awarded Apr 5 at 20:22

user585094

19710 bronze badges

If $S(t)$ is a $C_0$-semigroup, is $S(t-s)f(s)$ Bochner integrable?

Awarded Apr 5 at 8:10

Desura

2,01110 silver badges24 bronze badges

Prove that $\mu_*\leq\mu^*$ where the definition of an inner and outer measure is induced by a measure

Awarded Apr 5 at 2:00

Beerus

9911 gold badge2 silver badges20 bronze badges

What proofs are there of this result (on square roots and continued fractions)?

Awarded Apr 4 at 16:17

divadusthegreat

1968 bronze badges

Finding $E[X]$ from the joint density function of $X$ and $Y$.

Awarded Apr 3 at 4:32

billyandriam

2292 silver badges12 bronze badges

One of the numbers $\zeta(5), \zeta(7), \zeta(9), \zeta(11)$ is irrational

Awarded Apr 2 at 16:20

Max

5363 silver badges18 bronze badges

Understanding Folland's definition of two complex measures being mutually singular

Awarded Mar 30 at 22:41

Kimarokko

4933 silver badges10 bronze badges

Prove that the series $\sum_{k \in \mathbb{Z}}f(x+k) $ converges for all $x$ when $f$ is integrable and continuous

Awarded Mar 29 at 4:21

Abm

3111 silver badge8 bronze badges

Feasible direction for a point

Awarded Mar 28 at 11:02

elaRosca

1,1032 gold badges13 silver badges24 bronze badges

Find the radius of the circle tangent to $x^2, \sqrt{x}, x=2$

Awarded Mar 27 at 15:42

Stéphane Jaouen

3,2516 silver badges25 bronze badges

How do I show that $\sup_{0\leq x\leq1}|g(x)| \geq \int_0^1|g(x)|dx$

Awarded Mar 27 at 8:45

BenJames

2311 silver badge14 bronze badges

Convergence of hypergeometric 2F1 with z=-1

Awarded Mar 23 at 23:35

jorgen

9167 silver badges18 bronze badges

A walk into the desert and back - have some hard-won answers but can't see the pattern

Awarded Mar 22 at 22:11

Forero

1097 bronze badges

Isomorphism between distinguished triangles in a triangulated category

Awarded Mar 22 at 15:50

t_kln

1,0485 silver badges17 bronze badges

Ring with $1+1+\cdots+1$ invertible.

Awarded Mar 21 at 19:57

RemWheel

1678 bronze badges

Neural ODE definition of derivative $\frac{d L}{dz(t)}$ (adjoint)

Awarded Mar 21 at 5:04

Hyperplane

11.7k1 gold badge20 silver badges49 bronze badges

Integration of the HyperGeometric function DLMF 15.5.E8

Awarded Mar 20 at 13:27

rrogers

9861 gold badge5 silver badges23 bronze badges

Expectation of exponential of a sum of two Wiener processes

Awarded Mar 18 at 12:46

Yi Bao

6711 bronze badges

Trying to identify old book

Awarded Mar 17 at 7:25

Peter Jennings

1697 bronze badges

Given complex $|z_1|=r_1,|z_2|=r_2,|z_3|=r_3$, when $|z_1-z_2|+|z_1-z_3|+|z_3-z_2|$has max and what is it?

Awarded Mar 15 at 13:12

chenbai

7,5911 gold badge18 silver badges28 bronze badges

Asymptotic expansion of Polygamma functions

Awarded Mar 15 at 0:05

Manuel Eberl

8034 silver badges13 bronze badges

Solve the following equation: $\frac{1}{x^2}+\frac{1}{(4-\sqrt{3}x)^2}=1$

Awarded Mar 14 at 16:04

Deathkamp Drone

1,60211 silver badges25 bronze badges

Find the sum to n terms of the series

Awarded Mar 13 at 5:25

Shubham

4194 silver badges16 bronze badges

Isomorphisms of irreducible root systems

Awarded Mar 11 at 12:21

QGM

6133 silver badges10 bronze badges

Symmetric continued fractions property where $q^2\equiv(-1)^n$ mod $p$

Awarded Mar 9 at 0:15

Algebear

1,67410 silver badges21 bronze badges

Bounding box of intersections of lines in $O(n\log(n))$

Awarded Mar 8 at 3:47

Zan

1578 bronze badges

Combinatorial game played on a grid

Awarded Mar 7 at 13:07

elbarto36

1115 bronze badges

Orthogonality of first and second kinds of solutions of Bessel's equation.

Awarded Mar 7 at 10:42

Michael Levy

1,1006 silver badges22 bronze badges

Optimizing a functional with a differential equation as a constraint

Awarded Mar 4 at 7:42

Logan Tatham

2,5221 gold badge17 silver badges30 bronze badges

Closed form for infinite sum involving Chebyshev polynomials

Awarded Mar 3 at 1:17

edrezen

2331 silver badge6 bronze badges

Can L-smooth (L>0) convex function to be non-differentiable?

Awarded Feb 29 at 12:20

kaienfr

1996 bronze badges

Why is a closed monidal category enriched over itself?

Awarded Feb 29 at 11:28

zxcv

1,4457 silver badges21 bronze badges

Why is $\sum_{n=1}^{k}\frac{1}{n^2+n}=\frac{k}{k+1}$

Awarded Feb 28 at 22:55

Lucien Jaccon

36215 bronze badges

Radical representation of $\cos\frac {2\pi}{11}$

Awarded Feb 28 at 13:57

Aster

1,23011 silver badges21 bronze badges

Strange behaviour of $x^2+5x+7$ under iteration

Awarded Feb 28 at 10:53

TheOutZ

1,2568 silver badges18 bronze badges

Proving $nx - \sum_{i=1}^{n-1}i \binom{n}{i+1} (1-x)^{n-i-1} x^{i+1} = (1-(1-x)^n)$

Awarded Feb 28 at 6:01

nothatcreative5

3431 silver badge11 bronze badges

What are the zeros of the j-function?

Awarded Feb 28 at 0:50

user3131035

9835 silver badges14 bronze badges

Haar Measure of Product of Compact Sets

Awarded Feb 27 at 15:33

Vinay Deshpande

7793 silver badges14 bronze badges

Why do we introduce artificial variable in two phase simplex method?

Awarded Feb 26 at 20:41

Shariq

611 silver badge7 bronze badges

Deduction from Schanuel's conjecture

Awarded Feb 25 at 19:25

Mystery girl

5663 silver badges14 bronze badges

Inequality with logarithms and radicals of order 4

Awarded Feb 22 at 15:52

Last X

31110 bronze badges

Homomorphism from $\mathbb{Z}_p \to \mathrm{Aut}(\mathbb{Z}_p)$ for $p$ prime

Awarded Feb 22 at 8:21

MathMaestro

918 bronze badges

Linear Map of an ellipsoid in $\mathbb{R}^N$ into another ellipsoid in $\mathbb{R}^n$, with $n<N$

Awarded Feb 21 at 14:35

Vexx23

9347 silver badges19 bronze badges

Steps WA used to simplify $\left( \frac{\cos \beta \sin \beta \cos\phi +\sin \beta}{\sin^2 \phi + \sin^2\beta \cos^2 \phi} \right)^2\cos \phi$

Awarded Feb 21 at 5:06

rdemo

1738 bronze badges

Is the metric topology determined by its convergent sequences?

Awarded Feb 18 at 17:18

Atom

3,9251 gold badge8 silver badges21 bronze badges

Show the function defined on $[0,1] \times [0,1]$ via $\frac{x^2-y^2}{(x^2+y^2)^2}$ if $(x,y) \neq 0$ and $0$ otherwise is not integrable.

Awarded Feb 18 at 10:38

homosapien

4,1671 gold badge10 silver badges27 bronze badges

Proving $\sum_{i=m+1}^\infty \frac{m!^{i/m}}{i!}<1$.

Awarded Feb 14 at 8:27

Alma Arjuna

3,79910 silver badges41 bronze badges

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