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Chief theoretician of Soviet astronautics in the 1960s. Keldysh studied physics
and mathematics at Moscow University, obtaining his Ph.D. in 1938. He worked for
many years in a variety of positions at the Central Institute of Aerohydrodynamics,
Moscow University, and the Steklov Mathematical Institute. In 1960-61 he served
as vice president of the Soviet Academy of Sciences, and thereafter as its president
until 1975.
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