User Pietro Majer

120 votes

Suggestions for good notation

answered Oct 20, 2010 at 20:19

75 votes

German mathematical terms like "Nullstellensatz"

answered Apr 19, 2011 at 12:04

53 votes

Accepted

A topologist is not a mathematician - a small question

answered Aug 8, 2014 at 13:26

44 votes

What is your favorite proof of Tychonoff's Theorem?

answered May 30, 2010 at 7:25

42 votes

Why do we teach calculus students the derivative as a limit?

answered Sep 27, 2010 at 12:10

41 votes

Accepted

Is the sum $\sum\limits_{j=0}^{k-1}(-1)^{j+1}(k-j)^{2k-2} \binom{2k+1}{j} \ge 0?$

answered Jun 23, 2010 at 0:27

33 votes

A counterexample for Sard's theorem in $C^1$ regularity

answered Dec 27, 2016 at 20:02

31 votes

Did ancient mathematicians know Euler's characteristic for convex polyhedra?

answered Jan 14, 2014 at 19:28

31 votes

Compact embeddings of Sobolev spaces: a counterexample showing the Rellich-Kondrachov theorem is sharp

answered Nov 16, 2011 at 7:24

30 votes

Accepted

For which maps $S^1\to S^1$ is the winding number defined?

answered Apr 12, 2014 at 7:27

29 votes

What is the most useful non-existing object of your field?

answered Sep 29, 2014 at 7:47

28 votes

Interesting examples of vacuous / void entities

answered Nov 13, 2010 at 23:35

28 votes

Why is it still common to not motivate results in publications?

answered Sep 12, 2020 at 7:54

27 votes

Accepted

Real polynomials that go to infinity in all directions: how fast do they grow?

answered Apr 17, 2023 at 8:54

27 votes

Accepted

A Hölder continuous function which does not belong to any Sobolev space

answered Sep 15, 2010 at 8:06

25 votes

Asymptotic approximation of $x^\alpha$ by entire functions

answered May 28, 2010 at 17:45

25 votes

How do professional mathematicians learn new things?

answered Aug 2, 2010 at 7:21

25 votes

Accepted

Square of a continuous map

answered Mar 24, 2012 at 6:38

25 votes

Accepted

Binomial again, and again

answered Nov 17, 2016 at 23:13

25 votes

Are there such numbers?

answered Nov 22, 2012 at 10:44

24 votes

How to compute $\prod_{n=1}^{\infty} (1-p^{-n})$

answered Aug 14, 2012 at 20:07

24 votes

Geometric proof of the Vandermonde determinant?

answered Jun 24, 2010 at 0:00

24 votes

Why is the Gamma function shifted from the factorial by 1?

answered May 26, 2010 at 7:23

23 votes

Making N (set of all positive integers) a group

answered May 23, 2010 at 22:24

23 votes

is f a polynomial provided that it is "partially" smooth?

answered Apr 15, 2012 at 22:06

22 votes

Accepted

Noncombinatorial proofs of Ramsey's Theorem?

answered Jun 24, 2010 at 22:05

22 votes

What if Current Foundations of Mathematics are Inconsistent?

answered Oct 3, 2010 at 19:09

22 votes

Closed form of an infinite series

answered Jun 29, 2023 at 16:07

21 votes

Accepted

"Converse" of Taylor's theorem

answered Feb 15, 2012 at 10:48

21 votes

Accepted

Dual of the space of Hölder continuous functions?

answered Apr 10, 2012 at 15:08

Stack Exchange Network

875 Answers

Suggestions for good notation

German mathematical terms like "Nullstellensatz"

A topologist is not a mathematician - a small question

What is your favorite proof of Tychonoff's Theorem?

Why do we teach calculus students the derivative as a limit?

Is the sum $\sum\limits_{j=0}^{k-1}(-1)^{j+1}(k-j)^{2k-2} \binom{2k+1}{j} \ge 0?$

A counterexample for Sard's theorem in $C^1$ regularity

Did ancient mathematicians know Euler's characteristic for convex polyhedra?

Compact embeddings of Sobolev spaces: a counterexample showing the Rellich-Kondrachov theorem is sharp

For which maps $S^1\to S^1$ is the winding number defined?

What is the most useful non-existing object of your field?

Interesting examples of vacuous / void entities

Why is it still common to not motivate results in publications?

Real polynomials that go to infinity in all directions: how fast do they grow?

A Hölder continuous function which does not belong to any Sobolev space

Asymptotic approximation of $x^\alpha$ by entire functions

How do professional mathematicians learn new things?

Square of a continuous map

Binomial again, and again

Are there such numbers?

How to compute $\prod_{n=1}^{\infty} (1-p^{-n})$

Geometric proof of the Vandermonde determinant?

Why is the Gamma function shifted from the factorial by 1?

Making N (set of all positive integers) a group

is f a polynomial provided that it is "partially" smooth?

Noncombinatorial proofs of Ramsey's Theorem?

What if Current Foundations of Mathematics are Inconsistent?

Closed form of an infinite series

"Converse" of Taylor's theorem

Dual of the space of Hölder continuous functions?