NORMAL FAMILIES AND DIFFERENTIAL POLYNOMIALS

<正> Let n,k be two positive integers such that n≥k+ 4 and let a be a finire non-zero complex value. Suppose further that is a family of meronlorphic functions in a region D and that aj（z） （j=1,2,…,k-1） are holomorphic in D. If for every f（z） ∈,fk（z）+sum from j=1 to 1-1 aj（z）fj（z）- af（z）~ndoes not take a finite value(or it has a multiple value with multiplicity greater than[n/n-（k+3）]) and f（z） has a finite non-zero multiple value with multiplicity greater than k in D, then is normal there.