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Periodic points and invariant pseudomeasures for toral endomorphisms

Published online by Cambridge University Press:  19 September 2008

William A. Veech
Affiliation:
Department of Mathematics, Rice University, Houston, Texas 77251, USA
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Abstract

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Extending a result of Livsic [10] it is proved that the coboundary equation f(Tx)−f(x) = g(x) admits a C∞ solution f for C∞g when T is an ergodic toral endomorphism and g sums to zero over every periodic orbit. The same statement is false with C1 in place of C∞, in contrast to the Livsic (hyperbolic) theorem. In one dimension the ‘Lip α’ case leads to questions relating to the generalized Riemann hypothesis.

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Type
Research Article
Copyright
Copyright © Cambridge University Press 1986