Volodymyr Lohvynovych Rvachov (Ukrainian:Володимир Логвинович Рвачов; 21 October 1926,Chyhyryn – 26 April 2005,Kharkiv) was a Soviet and Ukrainianapplied mathematician andengineering scientist.[1]
Rvachov, the son of a teacher Logvin Fedorovich Rvachev, began studying at theKharkiv Polytechnic Institute in 1943, but the occupation of his home town by theGerman armed forces (Wehrmacht) forced him to flee and sign up for military service. After the war Rvachov was able to resume his studies at theUniversity of Lviv, from where he graduated in 1952 and where, three years later, attained his first doctorate with a work onelastic theory. Thereafter, he was in charge of the Department of Higher Mathematics at the Berdiansk Pedagogic Institute until 1963. During this time, he completed his dissertation on three-dimensional contact problems in elastic theory at theInstitute for Problems in Mechanics at theAcademy of Sciences of the Soviet Union, and was appointed professor at the age of 35.
Rvachov was in charge of theComputational Mathematics Department at the Kharkiv Institute of Radioelectronics from 1963 to 1967,[2] and afterwards was head of the Department of Applied Mathematics & Computer Methods at the Institute for Problems in Mechanical Engineering at theNational Academy of Sciences of Ukraine until he retired.
With his theory ofR-functions, Rvachov in 1963 founded a mathematical theory in which mathematical logic was linked with classical methods of mathematics and moderncybernetics. He summarized his findings in a monograph (1982) which did not gain international recognition until Vadim Shapiro’s English edition appeared six years later.[3]
With R-functions there appears the possibility of creating a constructive mathematical tool which incorporates the capabilities of classical continuous analysis and logic algebra. This allows one to overcome the main obstacle which hinders the use of variational methods when solving boundary problems in domains of complex shape with complex boundary conditions, this obstacle being connected with the construction of so-called coordinate sequences. In contrast to widely used methods of the network type (finite difference, finite and boundary elements), in the R-functions method all the geometric information present in the boundary value problem statement is reduced to analytical form, which allows one to search for a solution in the form of formulae called solution structures containing some indefinite functional components.[4]
Rvachov therefore provided computational mechanics with a new form of mathematical foundation with considerable heuristic potential.
Together with his students, he published more than 500 scientific papers and 17 monographs. He was elected a corresponding (1972) and later (1978) a full member of theNational Academy of Sciences of Ukraine.[5] He was awarded numerous honors in recognition of his pioneering findings.[6]
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