Rotational entropy for annulus homeomorphisms (Q916177)

We study admissible rotational behaviors of the orbits of annulus homeomorphisms, isotopic to the identity. Namely, we introduce a topological invariant, designated ``rotational entropy'', that quantifies the rotational complexity of a given mapping. The main result in the paper establishes that: Any annulus homeomorphism, isotopic to the identity, with finitely many periods has zero rotational entropy.