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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
Dec
7
accepted Whitehead double
Dec
7
asked Whitehead double
Nov
28
accepted evaluate two sums in analytic number theory
Nov
28
accepted what is the definition of “two parallel copies of a surface S”
Nov
27
revised evaluate two sums in analytic number theory
fix typos
Nov
27
asked evaluate two sums in analytic number theory
Nov
27
comment what is the definition of “two parallel copies of a surface S”
thanks, so it is kind of disjoint union, the resulting surface has genus 2g?
Nov
27
asked what is the definition of “two parallel copies of a surface S”
Nov
18
awarded  Citizen Patrol