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seen Nov 20 at 14:49

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
Mar
5
accepted seek results on existence of free subgroup with special property
Mar
3
revised seek results on existence of free subgroup with special property
deleted 108 characters in body
Mar
3
comment seek results on existence of free subgroup with special property
@mesel, you are right, I should directly say $G=SO(3)$ and ask whether such free subgroup exists or not.
Mar
3
asked seek results on existence of free subgroup with special property
Feb
4
comment question on isomorphism of abelian von neumann alegbras
Ok, thanks, I would check that, BTW, the paper mentioned in the question is the one by Popa and Sasyk on computation of first cohomology of Bernoulli action.
Feb
4
accepted question on isomorphism of abelian von neumann alegbras
Feb
4
comment question on isomorphism of abelian von neumann alegbras
thanks, you are right, $\oplus X_n$ does not make sense, I was thinking $X_n$ as modules when writing this, because I am often not sure whether to choose $\oplus M_n$ or $\prod M_n$ when generalizing some isomorphism that holds for finite tensor. BTW, could you give some references for the fact mentioned in your answer, I believed this is true but have trouble to find a proof.
Feb
3
asked question on isomorphism of abelian von neumann alegbras
Jan
14
accepted find a special free subsemigroup