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Answer a question more than 60 days later with score of 5 or more. This badge can be awarded multiple times.

Awarded 9276 times.

How to derive from Gauss's results on the volume of hyperbolic orthoscheme tetrahedron the formula of Bolyai?

Awarded 14 hours ago

user2554

1,9691 gold badge10 silver badges28 bronze badges

Has the mathematical content of Grothendieck's "Récoltes et Semailles" been used?

Awarded yesterday

user234212323

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Why are modular forms interesting?

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VS.

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Journals for undergraduates

Awarded Jul 17 at 2:27

Barry Cipra

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Journals for undergraduates

Awarded Jul 17 at 2:27

Margaret Friedland

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Most 'unintuitive' application of the Axiom of Choice?

Awarded Jul 15 at 22:17

Mirek Olšák

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Endomorphism ring of $J_0(p)$ and Hecke operators

Awarded Jul 15 at 20:26

user145307

2063 silver badges4 bronze badges

Internal $2$-categories

Awarded Jul 15 at 16:20

varkor

9,52125 silver badges64 bronze badges

Fast Fourier transform for graph Laplacian?

Awarded Jul 15 at 11:23

dranxo

8175 silver badges13 bronze badges

Closed form for binomial coefficient sum

Awarded Jul 15 at 9:31

Ira Gessel

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Has the technique of "sprinkling" been used in studying random matrices?

Awarded Jul 15 at 0:02

Terry Tao

112k32 gold badges450 silver badges532 bronze badges

Orthosymplectic superalgebra

Awarded Jul 13 at 20:12

Steven Sam

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Most memorable titles

Awarded Jul 13 at 1:25

Per Alexandersson

15.7k10 gold badges70 silver badges129 bronze badges

Is there a Whitney Embedding Theorem for non-smooth manifolds?

Awarded Jul 12 at 6:40

Moishe Kohan

10.4k1 gold badge32 silver badges55 bronze badges

Inverse gamma function?

Awarded Jul 10 at 18:40

E. Noujeim

1511 silver badge2 bronze badges

A sequence potentially consisting of only integers

Awarded Jul 8 at 12:30

Antoine de Saint Germain

1411 silver badge8 bronze badges

Thom's seminal cobordism paper in English?

Awarded Jul 7 at 21:19

DanielHarlow

5414 silver badges10 bronze badges

Hyperfinite type II_1 factor as the Clifford algebra

Awarded Jul 6 at 19:11

Peter

5563 silver badges14 bronze badges

Algebraization of second-order logic

Awarded Jul 5 at 3:41

Tegiri Nenashi

2844 silver badges11 bronze badges

Is the field of constructible numbers known to be decidable?

Awarded Jul 4 at 2:37

GuestPoster5678

1861 silver badge2 bronze badges

Global character of ABC/Szpiro inequalities

Awarded Jul 3 at 13:47

Kirti Joshi

1,5559 silver badges8 bronze badges

Representations of $\operatorname{Sp}(2g,\mathbb{Z}_3)$

Awarded Jul 3 at 12:25

Dave Benson

13.9k1 gold badge33 silver badges87 bronze badges

Estermann's argument for the binary additive divisor problem

Awarded Jul 3 at 3:42

Bob Vaughan

511 silver badge2 bronze badges

Rigid non-archimedean real closed fields

Awarded Jul 2 at 12:46

Dave Marker

3,46022 silver badges22 bronze badges

How to think of algebraic geometry in characteristic p?

Awarded Jul 1 at 1:23

Will Sawin

141k9 gold badges308 silver badges539 bronze badges

How strong is the Schröder–Bernstein theorem where one set is the natural numbers?

Awarded Jun 30 at 0:10

Mark Saving

2633 silver badges9 bronze badges

When is one 'ready' to make original contributions to mathematics?

Awarded Jun 29 at 12:32

Per Alexandersson

15.7k10 gold badges70 silver badges129 bronze badges

Examples of common false beliefs in mathematics

Awarded Jun 28 at 7:50

Or Shahar

4514 silver badges12 bronze badges

Examples of common false beliefs in mathematics

Awarded Jun 27 at 7:07

Masayoshi Kaneda

5993 silver badges12 bronze badges

Down-To-Earth Uses of de Rham Cohomology to Convince a Wide Audience of its Usefulness

Awarded Jun 27 at 7:07

Liviu Nicolaescu

34.3k2 gold badges90 silver badges163 bronze badges

Important open problems that have already been reduced to a finite but infeasible amount of computation

Awarded Jun 25 at 23:20

Mark S

2,1333 gold badges32 silver badges42 bronze badges

Why is Langlands functoriality usually related with period integral in a third group?

Awarded Jun 24 at 6:41

David Ben-Zvi

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Why arithmetic Langlands?

Awarded Jun 24 at 2:47

David Corwin

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Colloquial catchy statements encoding serious mathematics

Awarded Jun 23 at 19:07

Patricia Hersh

3,5021 gold badge30 silver badges34 bronze badges

Recreational mathematics: where to search?

Awarded Jun 22 at 3:20

Loren Cannon

11 silver badge1 bronze badge

Recreational mathematics: where to search?

Awarded Jun 22 at 3:20

KYZYL

11 silver badge2 bronze badges

Recreational mathematics: where to search?

Awarded Jun 22 at 3:20

Gerald Edgar

40.6k5 gold badges124 silver badges219 bronze badges

Good papers/books/essays about the thought process behind mathematical research

Awarded Jun 21 at 21:32

Michael Murray

1,13212 silver badges6 bronze badges

Cardinality of the permutations of an infinite set

Awarded Jun 21 at 14:43

Steve0078

511 silver badge1 bronze badge

Zariski density reference request

Awarded Jun 21 at 14:27

YCor

62.3k5 gold badges182 silver badges281 bronze badges

Is the derived category of $A$-dg-modules as a dg-category coincide with the ordinary definition of derived category?

Awarded Jun 20 at 20:40

Mykola Pochekai

1,2389 silver badges16 bronze badges

What math institutes offer research in pairs/research in teams?

Awarded Jun 16 at 19:04

José Figueroa-O'Farrill

33k4 gold badges102 silver badges183 bronze badges

Real analytic subvariety in complex manifold which is complex outside of its singular set

Awarded Jun 16 at 13:50

Thomas Kurbach

5131 gold badge5 silver badges13 bronze badges

Describe a topic in one sentence.

Awarded Jun 16 at 5:56

Piero D'Ancona

8,9271 gold badge33 silver badges57 bronze badges

The definition of ${}^{\circ} \mathcal{HT}^{\mathcal{D}\text{-}\Theta^{\pm \mathscr{ell}}}$ in Inter-universal Teichmüller theory

Awarded Jun 15 at 14:12

categoricalequivalent

2952 silver badges8 bronze badges

Identifying projective representations using "gauge-invariant" traces tr[V_g V_h V_k ... ]

Awarded Jun 15 at 2:27

Ehud Meir

5,01919 silver badges23 bronze badges

The inner product of a Clifford Algebra

Awarded Jun 14 at 13:51

Nicholas Todoroff

2012 silver badges4 bronze badges

Does p-adic $L$- function determine the $L$ function

Awarded Jun 14 at 13:51

François Brunault

20.6k2 gold badges51 silver badges100 bronze badges

What are the recommended books for an introductory study of elliptic curves?

Awarded Jun 14 at 10:10

Student

511 silver badge2 bronze badges

Upper bound total variation by Wasserstein distance for continuous distance

Awarded Jun 14 at 7:41

Minwoo Chae

511 silver badge3 bronze badges

Universities not listed on mathjobs

Awarded Jun 14 at 7:03

Patricia Hersh

3,5021 gold badge30 silver badges34 bronze badges

Where do surreal numbers come from and what do they mean?

Awarded Jun 14 at 5:11

djhjkhfjk

511 silver badge1 bronze badge

Demystifying complex numbers

Awarded Jun 12 at 6:25

Jan-Christoph Schlage-Puchta

9,1172 gold badges29 silver badges56 bronze badges

What are some proofs of Godel's Theorem which are *essentially different* from the original proof?

Awarded Jun 11 at 20:49

Eliezer Yudkowsky

5735 silver badges10 bronze badges

Is a composite of (co)monadic adjunctions (co)monadic?

Awarded Jun 11 at 18:33

Martin Brandenburg

62.1k11 gold badges198 silver badges415 bronze badges

What is the max number of self-segregating words of length n?

Awarded Jun 10 at 14:11

Ilya Bogdanov

22.6k53 silver badges90 bronze badges

Why should we believe in the axiom of regularity?

Awarded Jun 10 at 8:25

Rodrigo Freire

2,40718 silver badges17 bronze badges

How to prove the identity $L(2,(\frac{\cdot}3))=\frac2{15}\sum\limits_{k=1}^\infty\frac{48^k}{k(2k-1)\binom{4k}{2k}\binom{2k}k}$?

Awarded Jun 9 at 23:08

pisco

3812 silver badges8 bronze badges

Independence of P = NP?

Awarded Jun 9 at 20:46

none

511 silver badge1 bronze badge

Explicit formulas for Carnot-Carathéodory distances on Carnot groups

Awarded Jun 9 at 10:15

Piotr Hajlasz

27.5k5 gold badges84 silver badges179 bronze badges

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