Gerrit Lekkerker
Cornelis Gerrit Lekkerkerker , called Gerrit, (born February 7, 1922 in Harmelen , † July 24, 1999 ) was a Dutch mathematician .
Lekkerkerker studied mathematics from 1940 to 1943 and 1945 to 1949 at the University of Utrecht under Jurjen Koksma and Jan Popken , where he received his doctorate under Popken in 1955 ( On the Zeros of a Class of Dirichlet Series ). After completing his studies (1949) he was at the Mathematical Center in Amsterdam in the department of pure mathematics (head of Koksma). In 1953/54 he was on a study visit to Rome. From 1961 to 1986 he was a professor at the University of Amsterdam as the successor to Nicolaas Govert de Bruijn . There he also began to deal with functional analysis . During the student unrest, he was director of the Mathematical Institute from 1969 to 1973. In 1984 he withdrew from his professorship, although he had not yet reached retirement age. The reason was disputes over his theory of analysis (he saw his freedom of teaching endangered). But he was still mathematically active and prepared the second edition of his book on the geometry of numbers with Peter Gruber - the field found new topicality thanks to coding theory.
He dealt with analytical number theory and geometry of numbers (about which he wrote a standard work Geometry of Numbers , first published in 1969) and later with functional analysis. In the 1970s he dealt with the mathematical treatment of, for example, neutron transport (important in reactor physics ) and radiation transport in stars. He worked with Rutger Hangelbroek, who received his doctorate in 1973 in Groningen, and Hans Kaper from the Argonne National Laboratory . He also dealt with graph theory and topology.
He was co-editor of the Mededelingen van het Wiskundig Genootschap.
Fonts
- with Peter Gruber Geometry of Numbers , North Holland, 1969, 2nd edition 1987 (first edition sole author, Russian translation, Nauka, Moscow 2008)
- with Hans Kaper, J. Hejmantek Spectral methods in linear transport theory , Birkhäuser 1982
Web links
Individual evidence
- ↑ Gerrit Lekkerkerker in the Mathematics Genealogy Project (English)
| personal data | |
|---|---|
| SURNAME | Lekkerkerker, Gerrit |
| BRIEF DESCRIPTION | Dutch mathematician |
| DATE OF BIRTH | February 7, 1922 |
| PLACE OF BIRTH | Harmelen |
| DATE OF DEATH | July 24, 1999 |