Event № 274
I will describe a class of groups that act freely on the product of two trees. Consequently such groups are the fundamental groups of nonpositively curved square complexes.
The class of groups contains free groups and is closed under amalgamated free products along cyclic subgroups.
In a related result we show that every word-hyperbolic limit groups acts freely on the product of two trees. This is joint work with Frederic Haglund.