Almost commensurability of 3-dimensional Anosov flowsReport as inadecuate

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1 Mathematisches Institut Bern

Abstract : Two flows are topologically almost commensurable if, up to removing finitely many periodic orbits and taking finite coverings, they are topologically equivalent. We prove that all suspensions of automorphisms of the 2-dimensional torus and all geodesic flows on unit tangent bundles to hyperbolic 2-orbifolds are pairwise almost commensurable.

Keywords : geodesic flow Anosov flow 3-dimensional flow commensurability

Author: Pierre Dehornoy -



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