| The contact details of authors: | 1. Lapikova, Elena Semenovna Postgraduate student, Departament of Mathematical Analysis, I. Yakovlev Chuvash State Pedagogical University, Cheboksary
2. Yurinkina, Maria Nikolaevna Postgraduate student, Departament of Mathematical Analysis, I. Yakovlev Chuvash State Pedagogical University, Cheboksary
3. Kerzhaev, Alexandr Petrovich Postgraduate student, Departament of Mathematical Analysis, I. Yakovlev Chuvash State Pedagogical University, Cheboksary
4. Nikitin, Andrey Vitalevich Postgraduate student, Departament of Mathematical Analysis, I. Yakovlev Chuvash State Pedagogical University, Cheboksary
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