User James Propp

56 votes

12 answers

29k views

Is pi a good random number generator?

asked Jun 3, 2010 at 18:12

51 votes

3 answers

11k views

What is the difference between holonomy and monodromy?

asked May 4, 2012 at 0:47

45 votes

0 answers

910 views

Extending a line-arrangement so that the bounded components of its complement are triangles

asked Jan 20, 2014 at 19:45

37 votes

2 answers

4k views

1+2+3+4+… and −⅛

asked Feb 25, 2023 at 0:13

33 votes

4 answers

3k views

In what rigorous sense are Sperner's Lemma and the Brouwer Fixed Point Theorem equivalent?

asked May 22, 2013 at 5:08

33 votes

5 answers

6k views

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

asked Apr 28, 2011 at 18:31

32 votes

5 answers

11k views

Differentiable functions with discontinuous derivatives

asked Dec 19, 2013 at 15:18

31 votes

1 answer

2k views

solving linear equations made difficult

asked Jul 17, 2012 at 4:13

30 votes

3 answers

2k views

Do roots of these polynomials approach the negative of the Euler-Mascheroni constant?

asked Mar 2, 2023 at 4:33

27 votes

8 answers

1k views

Area-differences for lattice triangles in a checkerboard

asked Mar 4, 2022 at 1:56

27 votes

5 answers

2k views

Moments of area of random triangle inscribed in a circle

asked Jul 13, 2018 at 20:47

26 votes

3 answers

5k views

Surreal numbers vs. non-standard analysis

asked Mar 19, 2012 at 18:10

25 votes

14 answers

5k views

What are some examples of "chimeras" in mathematics?

asked Apr 28, 2011 at 18:34

25 votes

5 answers

1k views

Illustrating mathematics with wysiwyg tools

asked Feb 28, 2018 at 17:06

25 votes

2 answers

1k views

Exponential towers of $i$'s

asked Apr 29, 2020 at 17:16

24 votes

3 answers

858 views

an operation on binary strings

asked Jan 3, 2012 at 18:48

23 votes

4 answers

1k views

Dividing by two in the category of vector spaces

asked Apr 10, 2015 at 1:42

19 votes

2 answers

3k views

How bogus is the glitzy proof of Borsuk-Ulam?

asked Oct 11, 2016 at 21:33

19 votes

2 answers

729 views

Do all subtraction-free identities tropicalize?

asked Apr 10, 2013 at 16:23

19 votes

3 answers

844 views

In what ways is the standard Fourier basis optimal?

asked Jul 23, 2013 at 23:23

19 votes

3 answers

1k views

functions from Q to itself with derivative zero

asked Jul 11, 2012 at 1:30

19 votes

1 answer

605 views

How hard is it to tell when a finite set tiles the integers?

asked Apr 30, 2017 at 22:42

18 votes

2 answers

1k views

Formula for volume of $n$-ball for negative $n$

asked Mar 4, 2020 at 1:12

18 votes

2 answers

4k views

Propositions equivalent to the completeness of the real numbers

asked Apr 19, 2011 at 21:12

18 votes

2 answers

1k views

Nice sign-expansions of special surreal numbers

asked Aug 9, 2015 at 2:28

16 votes

2 answers

687 views

Comparing sizes of sets of natural numbers

asked Sep 4, 2016 at 3:59

16 votes

0 answers

2k views

Characterizing the surcomplex numbers

asked May 3, 2011 at 5:49

15 votes

2 answers

1k views

self-avoidance time of random walk

asked May 5, 2010 at 13:24

15 votes

5 answers

2k views

enumerative meaning of natural q-Catalan numbers

asked Apr 4, 2012 at 15:16

15 votes

5 answers

6k views

getting rid of existential quantifiers

asked Mar 6, 2012 at 1:28

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214 Questions

Is pi a good random number generator?

What is the difference between holonomy and monodromy?

Extending a line-arrangement so that the bounded components of its complement are triangles

1+2+3+4+… and −⅛

In what rigorous sense are Sperner's Lemma and the Brouwer Fixed Point Theorem equivalent?

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

Differentiable functions with discontinuous derivatives

solving linear equations made difficult

Do roots of these polynomials approach the negative of the Euler-Mascheroni constant?

Area-differences for lattice triangles in a checkerboard

Moments of area of random triangle inscribed in a circle

Surreal numbers vs. non-standard analysis

What are some examples of "chimeras" in mathematics?

Illustrating mathematics with wysiwyg tools

Exponential towers of $i$'s

an operation on binary strings

Dividing by two in the category of vector spaces

How bogus is the glitzy proof of Borsuk-Ulam?

Do all subtraction-free identities tropicalize?

In what ways is the standard Fourier basis optimal?

functions from Q to itself with derivative zero

How hard is it to tell when a finite set tiles the integers?

Formula for volume of $n$-ball for negative $n$

Propositions equivalent to the completeness of the real numbers

Nice sign-expansions of special surreal numbers

Comparing sizes of sets of natural numbers

Characterizing the surcomplex numbers

self-avoidance time of random walk

enumerative meaning of natural q-Catalan numbers

getting rid of existential quantifiers