User Tomer Vromen - Mathematics Stack Exchange

69 votes

A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language

answered Jul 21, 2010 at 15:33

32 votes

Accepted

Cardinality of all cardinalities

answered Aug 3, 2010 at 20:01

21 votes

Accepted

Find taxicab numbers in $O(n)$ time

answered Aug 19, 2010 at 20:06

12 votes

Are $x \cdot 0 = 0$, $x \cdot 1 = x$, and $-(-x) = x$ axioms?

answered Jul 21, 2010 at 20:28

11 votes

Non-Linear Transformation

answered Aug 5, 2010 at 10:33

9 votes

Accepted

What is a symmetric group?

answered Aug 6, 2010 at 23:25

8 votes

Given enough time, what are the chances I can come out ahead in a coin toss contest?

answered Jul 24, 2010 at 0:38

5 votes

Modular exponentiation using Euler’s theorem

answered Aug 5, 2010 at 15:13

4 votes

Party planning problem

answered Sep 28, 2010 at 14:02

1 vote

Accepted

Finding the Extrema Non-differentiable Functions.

answered Aug 5, 2010 at 19:53

0 votes

Are there any interesting semigroups that aren't monoids?

answered Jul 22, 2010 at 10:29

-1 votes

Sets. Classes. ...?

answered Aug 6, 2010 at 18:20

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12 Answers

A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language

Cardinality of all cardinalities

Find taxicab numbers in $O(n)$ time

Are $x \cdot 0 = 0$, $x \cdot 1 = x$, and $-(-x) = x$ axioms?

Non-Linear Transformation

What is a symmetric group?

Given enough time, what are the chances I can come out ahead in a coin toss contest?

Modular exponentiation using Euler’s theorem

Party planning problem

Finding the Extrema Non-differentiable Functions.

Are there any interesting semigroups that aren't monoids?

Sets. Classes. ...?