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Muchnik also made significant contributions to
Medvedev's theory of mass problems, introducing a generalisation of Turing degrees, called "Muchnik degrees", in 1963. Muchnik also elaborated
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Recursively
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independently introduced the priority method which gave an affirmative answer to
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Muchnik was married to the
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as "calculus of problems" and proved that the lattice of
Muchnik degrees is
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Muchnik's most significant contribution was on the subject of
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