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Oct
12
revised The behavior of a certain greedy algorithm for Erdős Discrepancy Problem
added 2 characters in body
Oct
12
revised Experimental Mathematics
added 157 characters in body
Oct
11
revised Experimental Mathematics
edited body
Oct
11
revised Experimental Mathematics
added 289 characters in body
Oct
9
revised Important formulas in Combinatorics
added 59 characters in body
Oct
8
comment Important formulas in Combinatorics
Dear Tom, Thanks for the addition. As there are few answers that fits to more than one topic and answers that contain more than one formula I represented in the illustration each answer by a single formula and interested viewers can, of course, jump to the full answer.
Oct
8
awarded  Famous Question
Oct
7
awarded  Nice Answer
Oct
7
awarded  Favorite Question
Oct
6
revised Important formulas in Combinatorics
added 518 characters in body
Oct
6
comment first Chern class of complex vector bundles and first Pontrjagin class of quaternionic vector bundles
Regardless of this particular question, in my opinion, "standard characteristic class stuff" like "standard applications of spectral sequences" like "standard facts about Floer homology" etc. are research-level mathematics as far as mathoverflow is concerned.
Oct
6
revised first Chern class of complex vector bundles and first Pontrjagin class of quaternionic vector bundles
deleted 39 characters in body
Oct
5
revised Proposals for polymath projects
deleted 2 characters in body
Oct
5
revised Important formulas in Combinatorics
added 47 characters in body
Oct
4
awarded  Necromancer
Oct
3
revised Examples of major theorems with very hard proofs that have NOT dramatically improved over time
added 100 characters in body
Oct
3
revised Experimental Mathematics
added 144 characters in body
Oct
2
awarded  Notable Question
Oct
2
comment Proposals for polymath projects
One more remark regarding the level of problems. In four out of the five first polymath projects the problems were well known and central open problems in their field (while not among the famous problems of mathematics). Polymath2 was a more open-ended project but it also reflected a question that experts in the relevant field were thinking about for decades.
Oct
1
revised Proposals for polymath projects
added 2095 characters in body