Invariant Differential Operators Associated with a Conformal Metric

摘要

Peschl defined invariant higher-order derivatives of a holomorphic or meromorphic function on the unit disk. Here, the invariance is concerned with the hyperbolic metric of the source domain and the canonical metric of the target domain. Minda and Schippers extended Peschl's invariant derivatives to the case of general con-formal metrics. We introduce similar invariant derivatives for smooth functions on a Riemann surface and show a complete analogue of Faa di Bruno's formula for the composition of a smooth function with a holomorphic map with respect to the derivatives. An interpretation of these derivatives in terms of intrinsic geometry and some applications will be also given.