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accepted find element in relative commutant of a matrix subalgebra
Jul
19
comment find element in relative commutant of a matrix subalgebra
Thanks, I realized that the basic idea is to integral over the unitary group of $M_2(\mathbb{C})$ of $uau^{*}$, matrix units seems to play the role of unitary.
Jul
19
revised find element in relative commutant of a matrix subalgebra
fix typos
Jul
19
answered find element in relative commutant of a matrix subalgebra
Jul
19
asked find element in relative commutant of a matrix subalgebra
Jul
9
comment Short exact sequence involving mapping cone, cone, suspension of $C^*$-algebras
Do we have a natural morphism from SB to SA?
Jul
9
comment Maximal Ideals and Maximal Subspaces in 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