Identifying the author of the Noh play by considering a rhythmic structure -Especially, Zeami's era-

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Mathematical analysis was conducted based on the part of speech of phrases of a Noh drama and the data of a vocabulary which were computed by the morphological analysis. It became clear that usage of the auxiliary verb of the Zeami's work had the feature.In the traditional Noh dramatist's identification research, various working hypotheses were submitted. It became now clear that "Kanehira" into whom an argument is divided had the feature of the Zeami's work.Moreover, the philological and phylogenetic result was also obtained.