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mau
  • Member for 13 years, 10 months
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49 votes
11 answers
22k views

Why does Benford's Law (or Zipf's Law) hold?

47 votes
2 answers
7k views

Sum of reciprocals of numbers with certain terms omitted

44 votes
5 answers
5k views

Turning coins on a chessboard

31 votes
5 answers
4k views

Pick's Theorem on a triangular (or hex) grid

5 votes
2 answers
3k views

Find all positive integers $a, b, c$ such that $1/a + 1/b + 1/c = 4/3999$

3 votes
3 answers
2k views

Robinson arithmetic and its incompleteness

3 votes
1 answer
1k views

Another puzzle with locks

20 votes
4 answers
1k views

Not quite Fermat's Last Theorem

9 votes
3 answers
1k views

what is actually a "definable" real number? [duplicate]

5 votes
1 answer
947 views

A generalization of Kirkman's schoolgirl problem

3 votes
1 answer
624 views

which equations may be solved with compass and a marked ruler?

2 votes
1 answer
399 views

Which is the first theorem in Euclid's Elements which uses Pasch's Axiom?

19 votes
1 answer
380 views

Generalization of Gray codes

6 votes
1 answer
361 views

Derangements and the "other" secretary problem

5 votes
1 answer
295 views

Is $e$ "constructable" with the appropriate tools?

4 votes
1 answer
210 views

Probability of having k defined elements while choosing m elements from a set of N

7 votes
2 answers
147 views

Find the length of a diagonal in an inscribed (non-regular) hexagon

1 vote
1 answer
133 views

Size of error when approximating $\pi$ using Buffon's needle

7 votes
1 answer
116 views

mole trapped in a snowball

6 votes
1 answer
116 views

What times can be measured with two hourglasses?

1 vote
0 answers
110 views

Which is the actual surface of a Möbius strip?

1 vote
0 answers
97 views

first example of backwards induction?

1 vote
0 answers
89 views

Spies - how to get an inequality?

2 votes
1 answer
78 views

true or false test when knowing absolutely nothing

0 votes
1 answer
41 views

Expected number of person not to get shot - reloaded

0 votes
0 answers
26 views

How may I generate a distribution which follows power law?