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visits member for 3 years, 2 months
seen Dec 16 at 19:17

Jul
9
comment Maximal ideals and maximal subspaces of normed algebras
Natural examples of commutative unital non banach normed algebras are $RG$ for some commutative ring $R$ and abelian group $G$. For non-unital algebra, take any proper ideal of some algebra.
Jul
9
comment determing constant in inequality with nonnegative numbers
Something wrong in the second summand, there is only one term can appear in this notation
Jul
7
asked an elementary problem on wreath product groups with combinatorial flavor
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
15
awarded  Necromancer
May
17
accepted An approximation question on projections
Mar
26
revised An approximation question on projections
added 242 characters in body
Mar
26
revised An approximation question on projections
added 3 characters in body
Mar
26
answered An approximation question on projections
Mar
26
comment An approximation question on projections
I am afraid the perturbation you mentioned is a different issue from the question I asked, my question asks whether we can find some abelian algebra close to some given almost commuting system, while perturbation says if we already know this, then blabla...
Mar
26
comment An approximation question on projections
Thanks, I would check that, and I fixed the typoes in second question.
Mar
26
revised An approximation question on projections
Fix typoes
Mar
26
revised An approximation question on projections
added 349 characters in body
Mar
26
asked An approximation question on projections
Mar
21
accepted are all finite index subgroups automorphic to each other?
Mar
21
asked are all finite index subgroups automorphic to each other?
Mar
5
comment A little question in elementary number theory
@Barry, thanks for this excellent link!
Mar
5
revised A little question in elementary number theory
added 162 characters in body
Mar
5
asked A little question in elementary number theory