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Dynamical systems and ergodic theory

A C^(1) counterexample to the entropy conjecture

OpenAI research collection · 1 manuscript · Source checked 2026-10-19

OpenAI's result summary

Constructs a noninvertible C^(1) self-map of a compact smooth manifold with zero topological entropy but eigenvalue 2 on second homology. This disproves the homological entropy lower bound for general C^(1) self-maps: homological growth need not force positive orbit complexity.

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MANUSCRIPT 01

A C^1 Counterexample to the Entropy Conjecture

We disprove the general C^(1) self-map formulation of Shub's entropy conjecture. We construct a noninvertible C^(1) self-map of a compact smooth manifold without boundary whose topological entropy is zero, while its action on second real homology has eigenvalue 2. Thus the topological entropy is strictly smaller than the…

Full source abstract

We disprove the general C^(1) self-map formulation of Shub's entropy conjecture. We construct a noninvertible C^(1) self-map of a compact smooth manifold without boundary whose topological entropy is zero, while its action on second real homology has eigenvalue 2. Thus the topological entropy is strictly smaller than the logarithm of the homological spectral radius.

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