The 80th anniversary of professor Vladimir Nikolaevich Bezverkhnii

The authors of the article set themselves two main tasks: to characterize the main stages of life of a professor at Tula State Lev Tolstoy Pedagogical University Vladimir Nikolaevich Bezverkhnii and to give a brief analysis of his scientific and pedagogical activity, which has a significant impact on the development of the combinatorial group theory.
The studies of Professor V. N. Bezverkhnii and his students on algorithmic problems in the theory of groups and semigroups are particularly noted.
V. N. Bezverkhnii, a student of Professor M. D. Grindlinger, conducts the seminar "Algorithmic Problems of Group and Semigroup Theory" and supervises postgraduate studies in combinatorial group theory.
Among his students, 8 people defended their Ph.D. theses, and one of them later became Doctor in Physics and Mathematics.