Sergey Chaplygin

Sergey Alexeyevich Chaplygin was a Russian and Soviet physicist, mathematician and mechanical engineer, born in 1869. He graduated from Moscow University in 1890 and later became a professor, teaching mechanical engineering at the Moscow Higher Courses for Women from 1901 and applied mathematics at the Moscow School of Technology from 1903, and he became Director of the courses in 1905. His work was greatly inspired by Nikolay Zhukovsky, the founder of the Central Institute of Aerodynamics, and his early research focused on hydromechanics. He is known for Chaplygin's equation and for the hypothetical substance in cosmology called Chaplygin gas. Leonid Sedov was one of his students.