Dedicated to the 95th anniversary of the outstanding scientist Academician of the National Academy of Sciences of Ukraine V.L. RVACHOV

The article is dedicated to the outstanding scientist of the twentieth century, Academician of the National Academy of Sciences of Ukraine Volodymyr Logvynovych Rvachev, who would have turned 95 in 2021. At one time VL Rvachev was the first rector of HIRE, in 1970 he became head of the Department of Theoretical and Mathematical Physics of KhPI (now it is the Department of Applied Mathematics). The name of this famous scientist is included in the golden pages of the history of mathematics and mechanics. The R-functions theory, as the main scientific discovery of his life, forever glorified VL Rvachev as a great scientist. He created also scientific school which is world-famous due to the numerous implementations and uniqueness of the RFM method. The main biographical data of the famous scientist are presented in the work, the versatility of the talented person, the depth of his life views, the breadth of horizons are emphasized. Particular attention is paid to the development and further application of the R-functions theory to solve modern problems. The response of close people, students and followers who remember their great Teacher is presented in words of gratitude to Volodymyr Logvynovych.