Reputation
1,418
Top tag
Next privilege 2,000 Rep.
Edit questions and answers
Badges
7 21
Impact
~18k people reached

Mar
24
revised approximate vanishing in Pontryagin dual
added 23 characters in body
Mar
24
revised approximate vanishing in Pontryagin dual
Add more rks
Mar
24
accepted when a crossed product group is inner amenable
Mar
24
asked approximate vanishing in Pontryagin dual
Mar
4
awarded  Custodian
Feb
17
answered when a crossed product group is inner amenable
Feb
16
revised when a crossed product group is inner amenable
Add one more condition
Feb
16
asked when a crossed product group is inner amenable
Jan
27
comment When two projections in a C*-algebra are “almost” Murray-von Neumann equivalent, they are equivalent
Intuitively, maybe we can first show that when $aa^*$ is close to $p$, then the range projection of $aa^*$, denote it by $r_1$, is close to $p$, maybe the assumption is strong enough to imply $||r_1-p||<1$, so they are unitary equivalent, do the same thing for $q$, note that $r_1, r_2$ are unitary equivalent.
Jan
26
accepted find a special group
Jan
26
asked find a special group
Jan
25
comment one end group with positve first Betti number$\beta^{(2)}_1(G)>0$
Thanks again! It is good to know that...
Jan
24
comment one end group with positve first Betti number$\beta^{(2)}_1(G)>0$
Thanks, to see the surface groups have one end, if my understanding is right, just look at the Cayley group(some tiling of the plane); is there any way to see directly that the surface groups could not be of the form predicted by the Stalling theorem? Btw, how to see in (2), $B^1$ is not closed?...
Jan
24
accepted one end group with positve first Betti number$\beta^{(2)}_1(G)>0$
Jan
23
asked one end group with positve first Betti number$\beta^{(2)}_1(G)>0$
Jan
22
accepted Extending a measurable map $f: G \to \mathbb{R}/\mathbb{Z}$ to a continuous group homomorphism
Jan
17
accepted Any infinite property (T) subgroup of $Aut(F_n)$?
Jan
16
asked Any infinite property (T) subgroup of $Aut(F_n)$?
Dec
21
awarded  Constituent
Dec
11
awarded  Caucus