Andrey Markov (Soviet mathematician)

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Andrey Andreyevich Markov Jr. (Russian: Андрей Андреевич Марков) (September 22, 1903 - October 11, 1979) was a Soviet mathematician, the son of the great Russian mathematician Andrey Andreyevich Markov Sr, and one of the key founders of the Russian school of constructive mathematics and logic. He has made outstanding contributions to various areas of mathematics, including differential equations, topology, mathematical logic and the foundations of Mathematics.

His name is in particular associated to the principle of Markov and to the rule of Markov. He also did work with Emil Post. In 1947 they found that word problem for semi-groups were unsolvable.