Abstract
LetF be a family of holomorphic functions in a domainD, and leta, b be two distinct finite complex numbers. If, for anyf ∈F,f andf′ sharea IM, andf′(z)=b wheneverf(z)=b, thenF is normal inD. This improves results due to Pang, Pang and Zalcman, Xu, etc.
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