To Vsevolod Alekseevich Solonnikov on the occasion of his jubilee

In 2003, we celebrate the 70th birthday of Vsevolod Alekseevich Solonnikov, a uniquely gifted mathematician and a world-renowed representative of the St. Petersburg mathematical school. His outstanding results on exact estimates of solutions for boundary-value and initial boundary-value problems for linear elliptic and parabolic systems, as well as for the Stokes system and its generalizations, and also on the mathematical study of hydrodynamical free boundary problems are well known in the world.