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68 votes

What are some noteworthy "mic-drop" moments in math?

answered Mar 11, 2019 at 15:34

16 votes

Taking a theorem as a definition and proving the original definition as a theorem

answered Sep 27, 2021 at 9:53

13 votes

Examples of major theorems with very hard proofs that have not dramatically improved over time

answered Dec 24, 2013 at 14:45

13 votes

Why are hypergeometric series important and do they have a geometric or heuristic motivation?

answered Sep 4, 2014 at 20:19

12 votes

Are there refuted analogues of the Riemann hypothesis?

answered Jul 25, 2014 at 10:13

11 votes

17 camels trick

answered Jun 8, 2017 at 8:29

7 votes

Accepted

First Explicit Irreducible Representations

answered Mar 11, 2015 at 11:14

7 votes

Concise introduction to Beta transformations

answered Mar 30, 2017 at 12:32

7 votes

Addition and multiplication are commutative but exponentiation and tetration are not. Do we know why?

answered Feb 7, 2023 at 23:27

6 votes

A second course in the representation theory

answered Aug 20, 2019 at 13:16

6 votes

Accepted

Maximal compact subroup is dense in Zariski?

answered Sep 25, 2017 at 13:16

6 votes

Geodesics on the sphere

answered Jan 15, 2019 at 11:05

5 votes

Accepted

Matrix representation of a certain algebra

answered Nov 18, 2016 at 11:12

4 votes

Asymmetric $A \iff B$ proofs

answered Jul 10, 2017 at 9:32

4 votes

Is the triple product in a Freudenthal triple system fully symmetric?

answered Jun 19, 2017 at 10:21

4 votes

Accepted

Number of Nice Matrices

answered Jun 10, 2015 at 12:32

3 votes

Accepted

"Diagonalizing" an associative algebra

answered Apr 22, 2015 at 11:53

3 votes

The Casimir invariant of an irreducible representation of a compact Lie group

answered May 15, 2017 at 21:25

3 votes

infinitesimal character of Langlands quotient for GL(n,R)

answered Jun 29, 2017 at 8:25

3 votes

Real representations of SO(n) and U(n)

answered Apr 3, 2020 at 9:05

2 votes

Zeros of polynomials related to Jensen polynomial associated with Riemann xi function $\xi(x)$

answered May 22, 2019 at 9:09

2 votes

The most cited paper in Mathematics

answered Mar 14, 2015 at 16:04

0 votes

Accepted

Regular graph such that $2$ distinct vertices have same neighborhood set

answered Jan 16, 2019 at 8:19

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23 Answers

What are some noteworthy "mic-drop" moments in math?

Taking a theorem as a definition and proving the original definition as a theorem

Examples of major theorems with very hard proofs that have not dramatically improved over time

Why are hypergeometric series important and do they have a geometric or heuristic motivation?

Are there refuted analogues of the Riemann hypothesis?

17 camels trick

First Explicit Irreducible Representations

Concise introduction to Beta transformations

Addition and multiplication are commutative but exponentiation and tetration are not. Do we know why?

A second course in the representation theory

Maximal compact subroup is dense in Zariski?

Geodesics on the sphere

Matrix representation of a certain algebra

Asymmetric $A \iff B$ proofs

Is the triple product in a Freudenthal triple system fully symmetric?

Number of Nice Matrices

"Diagonalizing" an associative algebra

The Casimir invariant of an irreducible representation of a compact Lie group

infinitesimal character of Langlands quotient for GL(n,R)

Real representations of SO(n) and U(n)

Zeros of polynomials related to Jensen polynomial associated with Riemann xi function $\xi(x)$

The most cited paper in Mathematics

Regular graph such that $2$ distinct vertices have same neighborhood set