Andrey Muchnik
Andrey Albertovich Muchnik (February 24, 1958 – March 18, 2007) was a Soviet and Russian mathematician known for his contributions to mathematical logic. He was awarded the A. N. Kolmogorov Prize in 2006. Biography 
Muchnik was born on February 24, 1958 to Albert Abramovich Muchnik and Nadezhda Mitrofanovna Ermolaeva. Both of his parents were mathematicians and students of P. S. Novikov. His father, Albert Muchnik, solved Post's problem about the existence of a non-trivial enumerable degree of Turing reducibility. He entered Moscow State University, where he began working as a mathematician at the seminar of Evgenii Landis and Yulij Ilyashenko for junior students of the Faculty of Mechanics and Mathematics of Lomonosov Moscow State University. His first work on differential equations was done in the second year under the guidance of Yu. S. Ilyashenko. Starting from the third year, he specialized in the definability theory at the Department of Mathematical Logic, where Alexei Semenov was his supervisor. His diploma (1981) was about the solution of the problem posed by Michael Rabin at the International Congress of Mathematicians in Nice to eliminate transfinite induction in the proof of Rabin's most important theorem on the solvability of the monadic theory of infinite tree. Later, Muchnik used his approach to prove a generalization of Rabin's theorem announced by Shelah and Stupp. Using the original idea of Alfred Tarski, he introduced in the notion of self-definability to obtain a short and elegant proof of Cobham-Semenov theorem. Later, he worked at the Institute of New Technologies and the Scientific Council of the USSR Academy of Sciences on the problem of cybernetics. Eventually, he was one of the leaders of the Kolmogorov seminar at Moscow State University. Muchnik also contributed fundamental results in the field of algorithmic information theory (Kolmogorov complexity). Many results obtained by himself and in collaboration with colleagues were published after his death. Awards 
Andrey was awarded the A.N. Kolmogorov Prize Laureate (together with Alexei Semenov, 2006) - for outstanding achievements in the field of mathematics for the series of works "On the refinement of A.N. Kolmogorov, related to the theory of chance". References

External links 
 Muchnik, Andrei Albertovich on the official website of the Russian Academy of Sciences
 Persons: Muchnik Andrey Albertovich. mathnet.ru. Retrieved 2016-3-15. Russian mathematicians
Soviet mathematicians
Moscow State University alumni
Academic staff of Moscow State University
1958 births
2007 deaths