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Accepted answer and score of 40 or more. This badge can be awarded multiple times.
Awarded 969 times.
Classification of (compact) Lie groups
Awarded Feb 14, 2021 at 11:26
Is it best to run or walk in the rain?
Awarded Feb 12, 2021 at 12:10
Why are there so many fractional derivatives?
Awarded Feb 10, 2021 at 6:27
Square root of a positive $C^\infty$ function.
Awarded Feb 9, 2021 at 20:21
What would remain of current mathematics without axiom of power set?
Awarded Feb 9, 2021 at 11:15
Why is the Gaussian so pervasive in mathematics?
Awarded Feb 8, 2021 at 22:50
Is there any use for $\sin(\sin x)$?
Awarded Feb 4, 2021 at 12:36
Who first dubbed them "expander graphs"?
Awarded Jan 30, 2021 at 10:16
Joyal's construction of the spectrum of a commutative ring
Awarded Jan 27, 2021 at 16:55
How to rewrite mathematics constructively?
Awarded Jan 24, 2021 at 16:06
The sum of two well-ordered subsets is well-ordered
Awarded Jan 22, 2021 at 13:06
What is the simplest proof that the density of primes goes to zero?
Awarded Jan 19, 2021 at 18:56
$p$-adic integrals and Cauchy's theorem
Awarded Jan 17, 2021 at 10:42
Criteria to determine whether a real-coefficient polynomial has real root?
Awarded Jan 15, 2021 at 16:55
Choice vs. countable choice
Awarded Jan 3, 2021 at 16:11
Evidence for integer factorization is in $P$
Awarded Dec 28, 2020 at 9:40
When does symmetry in an optimization problem imply that all variables are equal at optimality?
Awarded Dec 28, 2020 at 9:40
Rank of a module
Awarded Dec 22, 2020 at 11:36
Does the Pfaffian have a geometric meaning?
Awarded Dec 21, 2020 at 17:40
If d/dx is an operator, on what does it operate?
Awarded Dec 20, 2020 at 12:55
Arithmetic fixed point theorem
Awarded Dec 20, 2020 at 12:55
(post deleted or otherwise unavailable)
Awarded Dec 20, 2020 at 3:26
Wall Crossing in Physics and Mathematics
Awarded Dec 17, 2020 at 16:27
Does any research mathematics involve solving functional equations?
Awarded Dec 15, 2020 at 7:25
Inverting lower triangular matrix in time $n^2$
Awarded Dec 13, 2020 at 0:49
The "ds" which appears in an integral with respect to arclength is not a 1-form. What is it?
Awarded Dec 9, 2020 at 12:55
When $\frac{a^2}{b+c}＋\frac{b^2}{a+c}＋\frac{c^2}{a+b}$ is integer and $a,b,c$ are coprime natural numbers, is there a solution except (183,77,13)?
Awarded Dec 7, 2020 at 8:57
What are examples of (collections of) papers which "close" a field?
Awarded Nov 28, 2020 at 10:40
Given a polynomial-time algorithm, can we compute an explicit polynomial time bound just from the program?
Awarded Nov 23, 2020 at 12:10
Why does bosonic string theory require 26 spacetime dimensions?
Awarded Nov 22, 2020 at 14:51
What makes dependent type theory more suitable than set theory for proof assistants?
Awarded Nov 20, 2020 at 22:31
Isomorphic general linear groups implies isomorphic fields?
Awarded Nov 11, 2020 at 15:05
Who is the "young student" André Weil is referring to in his letter from the prison?
Awarded Nov 5, 2020 at 14:17
Does Pinelis' inequality (1994) exist?
Awarded Nov 4, 2020 at 12:57
$p$-adic Hodge Theory for rigid spaces, after P. Scholze
Awarded Nov 2, 2020 at 22:10
Does formally etale imply flat for noetherian schemes?
Awarded Oct 13, 2020 at 5:15
Understanding sphere packing in higher dimensions
Awarded Oct 10, 2020 at 13:20
Possible formal smoothness mistake in EGA
Awarded Oct 4, 2020 at 17:41
Categorical foundations without set theory
Awarded Oct 2, 2020 at 8:03
How to deal with an advisor that offers you nearly no advising at all?
Awarded Oct 1, 2020 at 20:05
Geometric meaning of the Euler sequence on $\mathbb{P}^n$ (Example 8.20.1 in Ch II of Hartshorne)
Awarded Sep 30, 2020 at 19:25
Grothendieck says: points are not mere points, but carry Galois group actions
Awarded Sep 24, 2020 at 19:02
What are the higher homotopy groups of Spec Z ?
Awarded Sep 22, 2020 at 22:36
What are good mathematical models for spider webs?
Awarded Sep 20, 2020 at 7:51
Is there an odd-order group whose order is the sum of the orders of the proper normal subgroups?
Awarded Sep 19, 2020 at 2:15
What is the difference between an automorphic form and a modular form?
Awarded Sep 8, 2020 at 17:40
What does the Lefschetz principle (in algebraic geometry) mean exactly?
Awarded Sep 7, 2020 at 17:05
Do sets with positive Lebesgue measure have same cardinality as R?
Awarded Sep 7, 2020 at 10:04
When is $SL(n,R) \rightarrow SL(n,R/q)$ surjective?
Awarded Sep 4, 2020 at 20:19
Why is uncomputability of the spectral decomposition not a problem?
Awarded Aug 27, 2020 at 13:36
What are the benefits of writing vector inner products as $\langle u, v\rangle$ as opposed to $u^T v$?
Awarded Aug 26, 2020 at 21:06
What is Ricardo Pérez-Marco's eñe product? Does it explain his statistical results on differences of zeta zeros?
Awarded Aug 18, 2020 at 16:16
Are dagger categories truly evil?
Awarded Aug 14, 2020 at 21:08
Understanding groups that are not linear
Awarded Aug 13, 2020 at 14:07
Does $\Bbb{CP}^{2n} \# \Bbb{CP}^{2n}$ ever support an almost complex structure?
Awarded Aug 11, 2020 at 1:31
Is it the referee's responsibility to verify results from arXiv preprints used in the refereed paper?
Awarded Aug 9, 2020 at 2:26
Triangulating surfaces
Awarded Aug 5, 2020 at 7:27
Can ZFC prove it cannot derive an inconsistency in $n$ steps?
Awarded Aug 5, 2020 at 3:07
Should water at the scale of a cell feel more like tar?
Awarded Aug 4, 2020 at 0:36
A strengthening of the Cauchy-Schwarz inequality
Awarded Jul 31, 2020 at 8:58
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