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Oct 23, 2010 at 21:14 vote accept Seva
Oct 23, 2010 at 14:33 answer added Qiaochu Yuan timeline score: 1
Oct 23, 2010 at 12:56 answer added Fedor Petrov timeline score: 6
Oct 23, 2010 at 12:35 comment added Suvrit Some simple calculations show that the trace of the matrix is $\lfloor \sqrt{n} \rfloor$, and the rank is $\lfloor \sqrt{4n+1}\rfloor-1$---but this does not seem to be immediately useful...
Oct 23, 2010 at 10:49 answer added KexiangXu timeline score: 0
Oct 23, 2010 at 9:59 history edited Seva CC BY-SA 2.5
added 10 characters in body; deleted 3 characters in body
Oct 23, 2010 at 9:48 history edited Seva CC BY-SA 2.5
added 145 characters in body; deleted 147 characters in body
Oct 23, 2010 at 9:39 history edited Seva CC BY-SA 2.5
added 397 characters in body; added 3 characters in body; added 11 characters in body; added 2 characters in body
Oct 23, 2010 at 6:31 comment added Denis Serre You're right. I wrongly supposed that so many rows are identical. I'll think again.
Oct 22, 2010 at 18:17 comment added Seva It is motivated by a problem in algebraic graph theory.
Oct 22, 2010 at 16:51 comment added Nikita Sidorov What's your motivation if I may ask?
Oct 22, 2010 at 11:57 history asked Seva CC BY-SA 2.5