科研之友
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摘要
We consider the rotation number rho(t) of a diffeomorphism f(t) = R-t o f, where R-t is the rotation by t and f is an orientation preserving C-infinity diffeomorphism of the circle S-1. We shall show that if rho(t) is irrational %26lt;br%26gt;lim sup(rho(t%26apos;) - rho(t))/(t%26apos; - t) %26gt;= 1. t%26apos; - 1
- 出版日期2012-3
