fedja's user avatar
fedja's user avatar
fedja's user avatar
fedja
  • Member for 14 years, 5 months
  • Last seen this week
134 votes
Accepted

Light reflecting off Christmas-tree balls

121 votes
Accepted

Is $ \sum\limits_{n=0}^\infty x^n / \sqrt{n!} $ positive?

87 votes

How To Present Mathematics To Non-Mathematicians?

87 votes

What's a nice argument that shows the volume of the unit ball in $\mathbb R^n$ approaches 0?

76 votes

Why should one still teach Riemann integration?

72 votes

How do you not forget old math?

70 votes

What are some deep theorems, and why are they considered deep?

64 votes

Thinking and Explaining

60 votes

Should one attack hard problems?

53 votes

The number $\pi$ and summation by $SL(2,\mathbb Z)$

52 votes
Accepted

Zeros of Gradient of Positive Polynomials.

49 votes

Putnam 2020 inequality for complex numbers in the unit circle

48 votes

A book you would like to write

47 votes

Is rigour just a ritual that most mathematicians wish to get rid of if they could?

45 votes
Accepted

Papers better than books?

43 votes
Accepted

The maximum of a polynomial on the unit circle

43 votes

Careers advice for Ph.D.s without current postdocs or university jobs

40 votes

Lost soul: loneliness in pursing math. Advice needed.

40 votes

Reproving a known theorem in an article

38 votes
Accepted

A counter example to Hahn-Banach separation theorem of convex sets.

37 votes
Accepted

Is there a good reason why $a^{2b} + b^{2a} \le 1$ when $a+b=1$?

35 votes

Jokes in the sense of Littlewood: examples?

35 votes

Can breadth hurt a job candidate?

35 votes

The Unreasonable Effectiveness of Physics in Mathematics. Why ? What/how to catch?

34 votes

Submission of a paper with a serious error to a good journal

34 votes
Accepted

Hahn-Banach theorem with convex majorant

33 votes
Accepted

Proving $\sum_{i=1}^{n}\sum_{j=1}^{n}\left\{\frac{x_{i}}{x_{j}}\right\}\le \frac{9}{14}n^2$?

32 votes
Accepted

Elementary solutions to f(z+1)-f(z)=g(z) in entire functions

31 votes
Accepted

Boys and Girls Revisited

30 votes

Deceptively simple inequality involving expectations of products of functions of just one variable

1
2 3 4 5
22