Take three integers m≥0,k≥1\documentclass[12pt]{minimal}
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\begin{document}$$m\ge 0,\,k\ge 1$$\end{document}, and n≥2\documentclass[12pt]{minimal}
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\begin{document}$$n\ge 2$$\end{document}. Let a(≢0)\documentclass[12pt]{minimal}
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\begin{document}$$a\ (\not \equiv 0)$$\end{document} be a holomorphic function in a domain D\documentclass[12pt]{minimal}
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\begin{document}$$D$$\end{document} of C\documentclass[12pt]{minimal}
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\begin{document}$$\mathbb {C}$$\end{document} such that multiplicities of zeros of a\documentclass[12pt]{minimal}
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\begin{document}$$a$$\end{document} are at most m\documentclass[12pt]{minimal}
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\begin{document}$$m$$\end{document} and divisible by n+1\documentclass[12pt]{minimal}
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\begin{document}$$n+1$$\end{document}. In this paper, we mainly obtain the following normality criterion: Let F\documentclass[12pt]{minimal}
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\begin{document}$${{{\fancyscript{F}}}}$$\end{document} be the family of meromorphic functions on D\documentclass[12pt]{minimal}
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\begin{document}$$D$$\end{document} such that multiplicities of zeros of each f∈F\documentclass[12pt]{minimal}
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\begin{document}$$f\in {{\fancyscript{F}}}$$\end{document} are at least k+m\documentclass[12pt]{minimal}
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\begin{document}$$k+m$$\end{document} and such that multiplicities of poles of f\documentclass[12pt]{minimal}
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\begin{document}$$f$$\end{document} are at least m+1\documentclass[12pt]{minimal}
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\begin{document}$$m+1$$\end{document}. If each pair (f,g)\documentclass[12pt]{minimal}
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\begin{document}$$(f,g)$$\end{document} of F\documentclass[12pt]{minimal}
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\begin{document}$${{\fancyscript{F}}}$$\end{document} satisfies that fnf(k)\documentclass[12pt]{minimal}
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\begin{document}$$f^{n}f^{(k)}$$\end{document} and gng(k)\documentclass[12pt]{minimal}
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\begin{document}$$g^{n}g^{(k)}$$\end{document} share a\documentclass[12pt]{minimal}
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\begin{document}$$a$$\end{document} (ignoring multiplicity), then F\documentclass[12pt]{minimal}
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\begin{document}$${{\fancyscript{F}}}$$\end{document} is normal.