Chaplygin, Sergey (1869-1942)

Chaplygin was a Russian physicist and mathematician. His early work was in hydromechanics, but he may be best known for the partial differential equation, Chaplygin's equation, that is used in the study of transonic flow.


Stamp Description
Russia, 30k, 1944
Scott: 945 A497
Russia, 1r, 1944
Scott: 946 A497