AJW Duijvestijn

from Wikipedia, the free encyclopedia
Black and white photo: Duijvestijn is sitting at his desk and smiling friendly at the camera
AJW Duijvestijn 1989

AJW Duijvestijn (born December 10, 1927 in The Hague , Netherlands as Adrianus Johannes Wilhelmus Duijvestijn ; † January 21, 1998 in Enschede , Netherlands), also called Arie Duijvestijn or AJW Duijvestijn , was a Dutch computer scientist and mathematician .

Life

Duijvestijn studied electrical engineering in Delft and graduated with a Master of Science degree in 1950 . In 1951 he moved to the mathematics center of the University of Amsterdam , where he - after a two-year break due to military service as a naval officer - earned a master's degree in mathematics in 1955 . Here he learned to at that time still quite primitive computing machines the program . In 1956 he joined the Philips Natuurkundig Laboratorium in Eindhoven . Duijvestijn spent the period from November 1957 to May 1958 in the USA at IBM in Poughkeepsie and Gaithersburg ; In 1963 he went to Philips in Apeldorn .

1962 doctorate Duijvestijn with his thesis advisor Prof. CJ Bouwcamp for Ph.D. at the Technical University of Eindhoven with a dissertation entitled "Electronic computation of squared rectangles". In 1965 he became a full professor of computer science at the University of Twente , where he remained until his retirement in 1989. From 1977 to 1981 Duijvestijn was President of the Nederlands Genootschap voor Informatica .

Duijvestijn had been married since 1953; he became the father of four children.

Special achievement

21 squares, all of different sizes, seamlessly join together to form a large square.
Simple , perfect squaring of the lowest possible order (21)

As early as 1962 in his dissertation Duijvestijn had with the problem of tiling of rectangles with square deals tiles. In the following years, with the help of a computer , he looked for the special case of the perfect, simple squaring of the square , but repeatedly failed because of the inadequate computing power of the computer technology of the time. In 1978 he finally had a sufficiently powerful computer with the PDP-10 from DEC and he found the perfect, simple quadrature of order 21 (see illustration). He also provided the proof that this is the solution of the lowest possible order and at the same time the only one of this order.

Fonts (selection)

  • Electronic computation of squared rectangles . Dissertation, Eindhoven University of Technology 1962. Online ( digitized version )
  • Simple perfect square of lowest order . University of Twente 1978. Online (digitized)
  • Simple Perfect Squared Squares and 2 × 1 Squared Rectangles of Orders 21 to 24 . University of Twente 1992. Online (digitized)
  • Catalog of simple perfect squared squares of orders 21 through 25 . Eindhoven University of Technology 1992 (together with CJ Bouwcamp). Online (digitized)
  • Simple perfect squared squares and 2 × 1 squared rectangles of order 26 . University of Twente 1996. Online

Individual evidence

  1. ↑ Duijvestijn 1962
  2. ↑ Duijvestijn 1978

literature

  • Jasper Dale Skinner: Squared squares: Who's who & what's what . Self-published, 1993, ISBN 978-0-9636569-0-2 .

Web links

personal data
SURNAME Duijvestijn, AJW
ALTERNATIVE NAMES Duijvestijn, Adrianus Johannes Wilhelmus (birth name); Duijvestijn, aria; Duijvestijn, AJW (full name)
BRIEF DESCRIPTION Dutch computer scientist and mathematician
DATE OF BIRTH December 10, 1927
PLACE OF BIRTH The Hague , Netherlands
DATE OF DEATH January 21, 1998
Place of death Enschede , the Netherlands