This Russian coin was issued in 2000 in occasion of the 150th anniversary of the birth of Sofia Kovalevskaya. Its back shows a portrait with the name in Cyrillic script together with the years of birth 1850 and death 1891, a rose, a set square, compasses and written pages, figures of the planet Saturn and of buildings. The nominal value of this coin is 2 Rubles (RUB).
Nikolai Iwanowitsch Lobatschewski
This coin from 1992 was issued in Russia in occasion of the 200th anniversary of birth of the mathematician Nicolai I. Lobachevski. The reverse side shows a portrait together with the name and the years of birth and death. It possesses the nominal value of 1 Ruble (RUR). These pictures are provided by P. Schreiber.