# Numerical Methods

Assuming I am given a Program which can calculate the value of a continuous, infinitely differntiable (we cannot calculate these derivatives), real, positive function of two real variables which has exactly one local (and global) minimum inside a given rectangle. Moreover the function is assumed to be sub-harmonic. My goal is to find the coordinates of the minimum, as accurately as possible, while using the given program as few times as possible (it takes a long time to run).

Is there some numerical method for solving such problems?