We study the normality of families of meromorphic functions related to a result of Drasin. We consider whether a family meromorphic functions F whose each function does not take zero is normal in D, if for every pair of functions f and g in F, f (z) and g (z) share ∞ or H(f)-1 and H(g)-1 share 0, where H(f):= f ~(k) (z)+ a _(k-1) f ~(k-1) (z)+, a _0 f(z). Some examples show that the conditions in our results are best possible.
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机译：我们研究了与Drasin相关的亚纯函数族的正常性。我们考虑如果D中的每对函数f和g的f（z）和g（z）共享∞或H（f）-1，则D中每个函数不取零的亚纯函数F是正常的。和H（g）-1共享0，其中H（f）：= f〜（k）（z）+ a _（k-1）f〜（k-1）（z）+，a _0 f（z ）。一些例子表明，我们的结果中的条件是最好的。
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