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M.G.
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23 answers
117 votes
9k views
46 bookmarks
MO-Hard Questions
16 answers
49 votes
4k views
27 bookmarks
Interesting (and not sufficiently answered) questions on math.SE
1 answer
28 votes
851 views
5 bookmarks
MO in the Notices of the AMS
2 answers
21 votes
726 views
7 bookmarks
Stack-exchange devoted to research problems, the suggested approaches and updates