Vladimir Ivanovich Smirnov was a Soviet mathematician who made significant contributions in both pure and applied mathematics, and also in the history of mathematics.
A Course in Higher Mathematics Volume I, 1930
Sergei Sobolev
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Prof Sergei Lvovich Sobolev, FRSE was a Soviet mathematician working in mathematical analysis and partial differential equations.
Vladimir Smirnov (mathematician)
…conjugate functions in Euclidean spaces. In the applied field his work includes the propagation of waves in elastic media with plane boundaries (with Sergei Sobolev) and the oscillations of elastic spheres. His pioneering approach to solving the initial-boundary value problem to the wave equation formed the basis…
Sobolev in 1970