Mathematics
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Old John's user avatar
Old John
  • Member for 11 years, 10 months
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16 Questions

Score Activity Newest Views
23 votes
5 answers
10k views

Solving linear congruences by hand: modular fractions and inverses

14 votes
2 answers
3k views

Finite groups of functions under function composition

17 votes
3 answers
2k views

Every closed set in $\mathbb R^2$ is boundary of some other subset

13 votes
2 answers
2k views

A puzzle with powers and tetration mod n

9 votes
4 answers
941 views

Hamel bases without (too much) axiomatic set theory

26 votes
1 answer
823 views

A problem of J. E. Littlewood

11 votes
2 answers
757 views

Local solutions of a Diophantine equation

18 votes
2 answers
727 views

Reference request in number theory for an analyst.

7 votes
4 answers
700 views

Almost a perfect cuboid

10 votes
1 answer
674 views

General Continued Fractions and Irrationality

4 votes
1 answer
508 views

A property of non-Archimedean metrics

2 votes
1 answer
460 views

Harmonic function with bounded preimage

11 votes
1 answer
368 views

Divisibility question from a very old textbook.

12 votes
2 answers
275 views

A problem in fractions from a very old arithmetic textbook

7 votes
0 answers
208 views

Unicoherence of non-euclidean spaces

4 votes
0 answers
153 views

Finding a closed expression for a calculated value.