Awarding M.V. Keldysh and I.G. Petrovsky

USSR. Moscow. April 1966. Ambassador Extraordinary and Plenipotentiary of Chile to the USSR Maximo Pacheco and Soviet mathematician, President of the USSR Academy of Sciences Mstislav Vsevolodovich Keldysh, who was awarded a silver medal by the University of Chile, (left to right) during the award ceremony. The exact date of the photo is unknown. Lev Porter/TASS