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ARG
  • Member for 12 years, 5 months
  • Last seen more than a week ago
42 votes
6 answers
7k views

What is geometrically the Pontryagin class?

20 votes
3 answers
2k views

Non-stably trivial bundle with trivial characteristic classes

18 votes
3 answers
2k views

what is a spinor structure?

17 votes
2 answers
2k views

Non-isomorphic groups with the same oriented Cayley graph

12 votes
3 answers
544 views

Estimate on currents in Cayley graphs

12 votes
0 answers
269 views

Star-shaped Folner sequence

11 votes
2 answers
525 views

Groups without property (T) but all finite quotients are expanders

11 votes
1 answer
524 views

Fourth obstruction, Pontryagin and Euler class

8 votes
0 answers
176 views

Sharp isoperimetry in the discrete Heisenberg group

8 votes
3 answers
454 views

Thin large subspaces of $\ell^N_1$

8 votes
2 answers
303 views

Does entropy of the random walk control the return probability

7 votes
0 answers
127 views

Can a lacunary hyperbolic group be Liouville?

7 votes
2 answers
963 views

What does the unique mean on weakly almost periodic functions look like?

7 votes
0 answers
924 views

A "direct" proof that hyperbolic groups are not amenable

7 votes
2 answers
880 views

Which 3-regular graphs are Schreier coset graphs?

7 votes
2 answers
404 views

Graph which do not satisfy a pseudo-Poincaré inequality

7 votes
0 answers
385 views

Sequence of graphs with small $\lambda_1$ (the smallest nonzero eigenvalue of a regular finite graph)

7 votes
2 answers
514 views

The kernel of all invariant means

6 votes
1 answer
712 views

left- and right- Folner sets

6 votes
1 answer
615 views

Random path in a graph

6 votes
1 answer
164 views

Distance to a geodesic ray

5 votes
0 answers
232 views

Groups with infinitely many finite conjugacy classes

5 votes
0 answers
143 views

Groups whose exponential growth is never pinched

5 votes
1 answer
737 views

Probabilities of a random walk exiting a set

5 votes
1 answer
497 views

Which hyperbolic tilings are Cayley graphs?

5 votes
1 answer
3k views

Weak convergence implying norm convergence

5 votes
1 answer
463 views

Complemented Subspaces and Riesz-Thorin interpolation

4 votes
2 answers
531 views

How does a quasi-isometry affect Poisson or Martin boundaries?

4 votes
1 answer
228 views

Contracting a planar graph to a (multiply-edged)-tree

4 votes
0 answers
189 views

Log-concavity of the growth function