John Pardon
  • Member for 10 years, 8 months
  • Last seen this week
110 answers
351 votes
83k views
369 bookmarks
Not especially famous, long-open problems which anyone can understand
7 answers
286 votes
19k views
134 bookmarks
Polynomial representing all nonnegative integers
25 answers
187 votes
43k views
114 bookmarks
The most outrageous (or ridiculous) conjectures in mathematics
8 answers
184 votes
11k views
99 bookmarks
Two commuting mappings in the disk
34 answers
135 votes
17k views
117 bookmarks
Short exact sequences every mathematician should know
6 answers
91 votes
26k views
71 bookmarks
How do I see LaTeX math on any web page and in email?
23 answers
89 votes
19k views
57 bookmarks
Examples of major theorems with very hard proofs that have not dramatically improved over time
3 answers
85 votes
8k views
74 bookmarks
What is homology anyway?
14 answers
82 votes
8k views
114 bookmarks
LaTeX tricks that save time in typesetting
10 answers
79 votes
9k views
34 bookmarks
Reflection principle vs universes
1 answers
70 votes
5k views
30 bookmarks
Nontrivial finite group with trivial group homologies?
7 answers
66 votes
4k views
35 bookmarks
Open project: Let's compute the Fourier expansion of a non-solvable algebraic Maass form.
2 answers
63 votes
3k views
28 bookmarks
Stiefel–Whitney classes in the spirit of Chern-Weil
1 answers
63 votes
10k views
27 bookmarks
Why is the Eisenstein ideal paper so great?
1 answers
62 votes
6k views
58 bookmarks
What is the relationship between motivic cohomology and the theory of motives?
7 answers
59 votes
6k views
44 bookmarks
Euler-Maclaurin formula and Riemann-Roch
3 answers
58 votes
5k views
45 bookmarks
A roadmap to Hairer's theory for taming infinities
4 answers
58 votes
5k views
36 bookmarks
What do theta functions have to do with quadratic reciprocity?
2 answers
57 votes
7k views
50 bookmarks
Are spectra really the same as cohomology theories?
3 answers
55 votes
6k views
28 bookmarks
Why do filtered colimits commute with finite limits?
6 answers
55 votes
5k views
35 bookmarks
What do Weierstrass points look like?
4 answers
54 votes
10k views
67 bookmarks
Geometric meaning of Cohen-Macaulay schemes
30 answers
53 votes
8k views
46 bookmarks
Fundamental problems whose solution seems completely out of reach
4 answers
50 votes
6k views
11 bookmarks
A historical mystery : Poincaré’s silence on Lebesgue integral and measure theory?
0 answers
49 votes
1k views
10 bookmarks
What is the current status of derived differential geometry?
3 answers
48 votes
5k views
53 bookmarks
What is the purpose of the flat/fppf/fpqc topologies?
1 answers
47 votes
2k views
23 bookmarks
Did Grothendieck have a plan for proving Riemann Existence algebraically?
2 answers
47 votes
1k views
11 bookmarks
Local structure of rational varieties
11 answers
45 votes
17k views
50 bookmarks
Intuition and/or visualisation of Ito integral/Ito's lemma
4 answers
44 votes
5k views
25 bookmarks
What is the source of this famous Grothendieck quote?
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