11 Answers votes newest views recent 0Reference for the geometry of horospheres 4It is well-known that hyperbolic space is delta-hyperbolic, but what is delta? 6Presentation for an infinite index subgroup of the braid group 4Reference for Unitary Group attached to $E/k$ 10Fundamental group of a compact space form. 7How far can the analogy between a Cayley graph and a symmetric space be pushed? 24What are your favorite instructional counterexamples? 1Experimental Mathematics 3Do decidable properties of finitely presented groups depend only on the profinitization? 4The finite subgroups of SL(2,C) 4What are some results in mathematics that have snappy proofs using model theory?