In this paper, we present several necessary and sufficient conditions for a harmonic mapping to be normal. Also, we discuss maximum principle and five-point theorem for normal harmonic mappings. Furthermore, we investigate the convergence of sequences for sense-preserving normal harmonic mappings and show that the asymptotic values and angular limits are identical for normal harmonic mappings.

中文翻译：

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正规调和映射的性质

在本文中，我们提出了调和映射为正态的几个充分必要条件。此外，我们讨论了正规调和映射的最大值原理和五点定理。此外，我们研究了保留意义的正常调和映射序列的收敛性，并表明渐近值和角度限制对于正常调和映射是相同的。