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First to answer and accepted with score of 10 or more. This badge can be awarded multiple times.

Awarded 11425 times.

Busy beaver function vs low Turing degrees

Awarded 11 hours ago

Dan Turetsky

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Is there a physical reason that fields in QFT are globally defined?

Awarded yesterday

Igor Khavkine

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Is the Tukey order well-founded

Awarded Dec 6 at 8:04

Gabe Goldberg

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What is the minimal density of a set A such that A+A = N?

Awarded Dec 4 at 20:36

Emil Jeřábek

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Euler's proof of $\frac{\pi}{6}=1-\frac{1}{2}-\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}-\cdots$

Awarded Dec 3 at 22:51

GH from MO

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Extensions of $PA+\neg Con(PA)$ with large consistency strength

Awarded Dec 3 at 3:35

Joel David Hamkins

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Upper bounds on the permanent of dense 0-1 matrix

Awarded Dec 1 at 21:41

Richard Stanley

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Is the Gelfand-Graev character isomorphic to a cohomology group for some sheaf on a Deligne-Lusztig variety?

Awarded Dec 1 at 15:48

Jim Humphreys

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Is this a typo in Macdonald's paper "The Poincaré Series of a Coxeter Group"?

Awarded Dec 1 at 8:31

Grant B.

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How can I evaluate the following sum?

Awarded Dec 1 at 8:31

Alexandre Eremenko

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When are configuration spaces aspherical?

Awarded Nov 30 at 16:22

Qiaochu Yuan

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Reference request: Grothendieck´s period conjecture?

Awarded Nov 30 at 11:57

abx

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Which popular games have been studied mathematically?

Awarded Nov 30 at 0:18

Will Brian

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How important is it for one on the job market to have thought about suitable REU projects?

Awarded Nov 30 at 0:18

paul garrett

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What are the implications of the new quasi-polynomial time solution for the Graph Isomorphism problem?

Awarded Nov 30 at 0:18

Timothy Chow

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Conjecture: Given any five points, we can always draw a pair of non-intersecting circles whose diameter endpoints are four of those points

Awarded Nov 29 at 12:08

Iosif Pinelis

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Non-simple groups $G$ with only non-trivial quotient isomorphic to $G$

Awarded Nov 28 at 19:51

YCor

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Find a special integer coefficients polynomial which takes small absolute value on [0,4]

Awarded Nov 28 at 14:09

David E Speyer

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Hausdorff and Naive Set Theory

Awarded Nov 27 at 19:09

John Stillwell

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Is $S_\omega/F_\omega$ embeddable to $S_\omega$?

Awarded Nov 27 at 10:49

YCor

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Is $1 = \sum_{n=1}^{\infty} \frac{\pi(p_n^2)-n+2}{p_n^3-p_n}$ , where $\pi$ denotes the prime counting function and $p_n$ denotes the $n$-th prime?

Awarded Nov 27 at 9:56

GH from MO

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On the connections between condensed mathematics and homotopy theory

Awarded Nov 25 at 19:56

Maxime Ramzi

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Properties of vector spaces without AC

Awarded Nov 24 at 19:55

Asaf Karagila♦

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Can a birational morphism between smooth varieties be dominated by smooth blowup sequences?

Awarded Nov 24 at 19:10

Karl Schwede

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Kakeya and Nikodym maximal functions

Awarded Nov 24 at 19:10

Terry Tao

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Intuition of Kolmogorov-Sinai entropy

Awarded Nov 22 at 18:33

Douglas Lind

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Are Berkeley cardinals easier to refute in ZFC than Reinhardt cardinals?

Awarded Nov 21 at 19:57

Gabe Goldberg

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For which subgroups the transfer map kills a given element of a group?

Awarded Nov 21 at 16:56

Kasper Andersen

1,60412 silver badges10 bronze badges

A strange product forcing

Awarded Nov 20 at 2:50

Joel David Hamkins

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Random sample of spanning trees

Awarded Nov 17 at 7:47

Tony Huynh

30.9k11 gold badges108 silver badges180 bronze badges

Are there $2^{\aleph_0}$ pairwise non-isomorphic countable groups containing every finite group?

Awarded Nov 16 at 21:41

Sean Eberhard

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Solvable groups that are linear over $\mathbb{C}$ but not over $\mathbb{Q}$?

Awarded Nov 16 at 15:01

YCor

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Ill-founded models of set theory with well-founded ordinals

Awarded Nov 16 at 11:33

Ali Enayat

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Prove that $\Bbb C[x,y]/(x^3+y^3-1)$ is not a UFD

Awarded Nov 15 at 22:55

GH from MO

94.9k6 gold badges256 silver badges352 bronze badges

Intersection cohomology and Poincaré duality

Awarded Nov 15 at 20:16

Will Sawin

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Coarsest admissible topology on $\text{Cont}(X,Y)$

Awarded Nov 15 at 19:25

Eric Wofsey

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Derived category of local systems of finite type on a $K(\pi,1)$ space: an explicit counterexample

Awarded Nov 15 at 17:55

Will Sawin

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$C^k$ version of Hadamard's Lemma. Differentiability of the remainder

Awarded Nov 15 at 12:35

Christian Remling

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Background for Varifold theory

Awarded Nov 15 at 0:42

mlk

1,8691 gold badge14 silver badges14 bronze badges

Non-Schwartz test functions for the explicit formula for L-functions

Awarded Nov 14 at 22:06

2734364041

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Is there a reason for different nomenclature on Calculus of Variations?

Awarded Nov 14 at 19:17

Willie Wong

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What variational problem does the parabolic suspension bridge solve?

Awarded Nov 14 at 15:30

Carlo Beenakker

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Classifying space of a non-discrete group and relationship between group homology and topological homology of Lie groups

Awarded Nov 13 at 22:41

Dave Benson

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2x2-determinantal representations of cubic curves

Awarded Nov 11 at 17:06

Zach Teitler

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How does Sage order the elements of the symmetric group?

Awarded Nov 9 at 18:51

Sean Eberhard

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Can every integer be written as a sum of squares of primes?

Awarded Nov 9 at 18:51

GH from MO

94.9k6 gold badges256 silver badges352 bronze badges

Existence of skeletons in ZFC

Awarded Nov 9 at 16:50

James Hanson

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"Conjugacy rank" of two matrices over field extension

Awarded Nov 9 at 14:11

t3suji

4,4301 gold badge22 silver badges28 bronze badges

Manifolds with negative dimension – Definition, References

Awarded Nov 9 at 5:08

Dmitri Pavlov

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When does the shape operator commute with a derivative?

Awarded Nov 8 at 19:01

Robert Bryant

106k8 gold badges330 silver badges438 bronze badges

A gerrymandering problem - can you always turn a tie into a landslide victory?

Awarded Nov 8 at 15:25

Saúl RM

7,8362 gold badges20 silver badges33 bronze badges

L-functions of Calabi-Yau varieties

Awarded Nov 7 at 15:25

Pasten

7637 silver badges11 bronze badges

A Poincaré-like inequality

Awarded Nov 7 at 12:36

Christian Remling

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Relation between the Alexander module of a link and intermediate free abelian covers

Awarded Nov 7 at 12:36

Stefan Friedl

2,56713 silver badges23 bronze badges

how to find derivative of a stochastic process?

Awarded Nov 6 at 1:06

vonjd

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How does the cohomology of the Lubin-Tate/Drinfeld tower fit into categorical p-adic local Langlands?

Awarded Nov 4 at 14:27

Peter Scholze

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Prime gaps within which every "small" prime appears as a factor: Are there only finitely many? Is this the last one?

Awarded Nov 4 at 4:33

Will Sawin

131k9 gold badges285 silver badges510 bronze badges

Is there a definition of $\log(x)$ for quaternion/octonion $x$?

Awarded Nov 3 at 16:32

Dave Benson

9,7311 gold badge23 silver badges63 bronze badges

A dice probability question

Awarded Nov 3 at 15:46

Brendan McKay

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A better version of Weyl's Law or uniform estimates of Laplacian higher eigenvalues

Awarded Nov 3 at 12:10

Gabe K

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