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. Landisat 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