Evgenii Mikhailovich Landis (russian: Евге́ний Миха́йлович Ла́ндис, ''Yevgeny Mikhaylovich Landis''; 6 October 1921 – 12 December 1997) was a

Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nation ...

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

who worked mainly on partial differential equations.

Life

Landis was born in

Kharkiv Kharkiv ( uk, wikt:Харків, Ха́рків, ), also known as Kharkov (russian: Харькoв, ), is the second-largest List of cities in Ukraine, city and List of hromadas of Ukraine, municipality in Ukraine.Ukrainian SSR The Ukrainian Soviet Socialist Republic ( uk, Украї́нська Радя́нська Соціалісти́чна Респу́бліка, ; russian: Украи́нская Сове́тская Социалисти́ческая Респ ...

, Soviet Union. He was Jewish. He studied and worked at the

Moscow State University M. V. Lomonosov Moscow State University (MSU; russian: Московский государственный университет имени М. В. Ломоносова) is a public research university in Moscow, Russia and the most prestigious ...

, where his advisor was

Alexander Kronrod Aleksandr Semyonovich Kronrod (russian: Алекса́ндр Семёнович Кронро́д; October 22, 1921 – October 6, 1986) was a Soviet mathematician and computer scientist, best known for the Gauss–Kronrod quadrature formula wh ...

, and later Ivan Petrovsky. In 1946, together with Kronrod, he rediscovered

Sard's lemma In mathematics, Sard's theorem, also known as Sard's lemma or the Morse–Sard theorem, is a result in mathematical analysis that asserts that the set of critical values (that is, the image of the set of critical points) of a smooth functi ...

, unknown in USSR at the time. Later, he worked on uniqueness theorems for elliptic and parabolic differential equations, Harnack inequalities, and Phragmén–Lindelöf type theorems. With

Georgy Adelson-Velsky Georgy Maximovich Adelson-Velsky (russian: Гео́ргий Макси́мович Адельсо́н-Ве́льский; name is sometimes transliterated as Georgii Adelson-Velskii) (8 January 1922 – 26 April 2014) was a Soviet and Israeli m ...

, he invented the

AVL tree In computer science, an AVL tree (named after inventors Adelson-Velsky and Landis) is a self-balancing binary search tree. It was the first such data structure to be invented. In an AVL tree, the heights of the two child subtrees of any nod ...

data structure (where "AVL" stands for Adelson-Velsky Landis). He died in

Moscow Moscow ( , US chiefly ; rus, links=no, Москва, r=Moskva, p=mɐskˈva, a=Москва.ogg) is the capital and largest city of Russia. The city stands on the Moskva River in Central Russia, with a population estimated at 13.0 millio ...

. His students include Yulij Ilyashenko.

External links

*
Biography of Y.M. Landis
at the

International Centre for Mathematical Sciences The International Centre for Mathematical Sciences (ICMS) is a mathematical research centre based in Edinburgh. According to its website, the centre is "designed to bring together mathematicians and practitioners in science, industry and commerce ...

. 20th-century Russian mathematicians Soviet mathematicians Soviet inventors Moscow State University alumni 1921 births 1997 deaths Mathematical analysts Ukrainian Jews Ukrainian mathematicians Ukrainian inventors {{Ukraine-mathematician-stub