“…In 1999, Yang [10] confirmed that the Conjecture is also true when f is replaced by f (k) (k ≥ 2) and f is of finite order. In recent years, many results have been published concerning the above conjecture, see [2,5,7,8,14,15,16,17,18] etc., and Zhang [17] was the first author who considers the case when f is a meromorphic function.…”