Publication

The cup product of Brooks quasimorphisms

Nicolas Monod, Michelle Karlsson-Bucher
2018
Journal Articles

Abstract

We prove the vanishing of the cup product of the bounded cohomology classes associated to any two Brooks quasimorphisms on the free group. This is a consequence of the vanishing of the square of a universal class for tree automorphism groups.

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The cup product of Brooks quasimorphisms

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