Abstract:
The well-known theorem of Plessner obtained for arbitrary harmonic functions by Japanese mathematician S. Yamashita is refined. In addition, one result obtained by Prof. V. I. Gavrilov for meromorphic functions is extended to harmonic functions.
Key words:unit circle, harmonic and holomorphic functions, the $P$ and $P'$ sequences, Plesner's and Fatou's points.
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