Meromorphic Functions Sharing the Same Zeros and Poles In this paper, Hinkkanen's problem (1984) is completely solved, {\em i.e.,} it is shown that any meromorphic function $f$ is determined by its zeros and poles and the zeros of $f^{(j)}$ for $j=1,2,3,4$ Keywords:Uniqueness, meromorphic functions, Nevanlinna theoryCategory:30D35