215 LAVRENTEV 



Ukrainian S.S.R. Academy of Sciences in 1939, and in 1946 

 Academician of the U. S.S.R. Academy of Sciences. Lavrentev 

 has been a member of the Communist Party of the Soviet Union 

 since 1952. In 1957 he became a member of the Czechoslovaki- 

 an Academy of Sciences. He was a deputy to the U. S.S.R. Su- 

 preme Soviet (5th Convocation). Lavrentev was elected again a 

 deputy from RSFSR to the Supreme Soviet in March 1962. In 

 1946 and 1949, he was awarded Stalin Prizes, and in 1960 re- 

 ceived the Order of Lenin. 



Lavrentev has been interested in the theory of the function 

 of a complex variable, the metric study of the conformity of the 

 boundaries at conformal mapping, and the properties of 

 functions that can be represented by converging series of poly- 

 nomials. He worked out the theory of quasi -conformal map- 

 ping, which is the basis of geometric methods of solving a wide 

 range of problems in mathematics and mathematical physics. 

 Lavrentev did a great deal of work on problems of the me- 

 chanics of a continuous medium and on hydrodynamics such as 

 the theory of flows and a new theory of non-linear waves. 



As of 1961, Lavrentev was Director of the Institute of Hydro- 

 dynamics of the Siberian Branch U.S.S.R. Academy of Sciences 

 and, in the same year, he was elected to the Central Committee 

 of the Communist Party. 

 Bibliography: 



On the theory of conformal mapping. Works of the Physico- 

 Mathematical Institute of V. A. Steklov, 1934, 5^. 

 Some properties of single leaf functions with application to 

 the theory of flows. Mat. Sbornik, 1938, 4, #3. 

 General problem of the theory of quasi-conformal mapping 

 of plane regions. Mat. Sbornik, New Series, 1947, 21, #2. 

 Main theorem of the theory of quasi-conformal mapping of 

 plane regions. Izvest. Akad. Nauk S.S.S.R., Ser. Mat., 1948, 

 12, #6. 

 Biography: 



M. V. Keldysh . On the 50th birthday of M. A. Lavrentev. 

 Izvest. Akad. Nauk S.S.S.R., Ser. Mat, 1951, 15, 1. 

 Mathematics in the U.S.S.R. during the last 30 Years. Col- 

 lection of Articles. Moscow -Leningrad: 1948. 

 Office: President, Siberian Department of USSR Academy 



of Sciences 

 Novosibirsk, Siberia 



