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Babgen

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1,162 reputation
313
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location Yerevan, Armenia
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visits member for 2 years, 1 month
seen yesterday
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1,162 reputation
 bio website visits member for 2 years, 1 month
313 badges
 location Yerevan, Armenia seen yesterday
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Example of a Borel set that is neither $F_\sigma$ nor $G_\delta$

real-analysis general-topology measure-theory descriptive-set-theory
nov 11 '11 at 19:54 t.b. 43.5k
2
30
votes
2
answers
373
views

Is it true in an arbitrary field that $-1$ is a sum of two squares iff it is a sum of three squares?

field-theory
apr 19 '12 at 16:53 Community♦ 1
2
3
votes
1
answer
67
views

Condition for a vertex-transitive graph to be symmetric

abstract-algebra group-theory algebraic-graph-theory
may 25 '12 at 11:01 utdiscant 1,474
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