Sergey S. Kislitsyn, () is a Russian mathematician, specializing in

combinatorics Combinatorics is an area of mathematics primarily concerned with counting, both as a means and as an end to obtaining results, and certain properties of finite structures. It is closely related to many other areas of mathematics and has many ...

and

coding theory Coding theory is the study of the properties of codes and their respective fitness for specific applications. Codes are used for data compression, cryptography, error detection and correction, data transmission and computer data storage, data sto ...

. Kislitsyn was born January 5, 1935, in

Ivanovo Ivanovo (, ) is a types of inhabited localities in Russia, city in Russia and the administrative center and largest city of Ivanovo Oblast, located northeast of Moscow and approximately from Yaroslavl, Vladimir, Russia, Vladimir and Kostroma. ...

Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

. He received his M.S. in mathematics from

Leningrad State University Saint Petersburg State University (SPBGU; ) is a public research university in Saint Petersburg, Russia, and one of the oldest and most prestigious universities in Russia. Founded in 1724 by a decree of Peter the Great, the university from the be ...

in 1957. From 1962 until 1970 he worked at Yekaterinburg branch of the

Steklov Institute of Mathematics Steklov Institute of Mathematics or Steklov Mathematical Institute () is a premier research institute based in Moscow, specialized in mathematics, and a part of the Russian Academy of Sciences. The institute is named after Vladimir Andreevich Stek ...

(). He defended his Ph.D. thesis in 1964 and continued working as a lecturer at Krasnoyarsk State University. Kislitsyn is known for posing the 1/3–2/3 conjecture for

linear extension In order theory, a branch of mathematics, a linear extension of a partial order is a total order (or linear order) that is compatible with the partial order. As a classic example, the lexicographic order of totally ordered sets is a linear extensi ...

s of finite posets, which he published in 1968. The conjecture is established in several special cases but open in full generality.

References

{{DEFAULTSORT:Kislitsyn, Sergey 1935 births 20th-century Russian mathematicians Saint Petersburg State University alumni Academic staff of the Steklov Institute of Mathematics Academic staff of Ural State University Scientists from Yekaterinburg Living people