Jan Willem Klop

Jan Willem Klop (19 December 1945 Ã¢ÂÂ 28 September 2025) was a Dutch mathematician who was professor of applied logic at Vrije Universiteit in Amsterdam. He held a Ph.D. in mathematical logic from Utrecht University. Klop is known for his work on the algebra of communicating processes, co-author of TeReSe and his fixed point combinator

Y<sub>k</sub> = (L L L L L L L L L L L L L L L L L L L L L L L L L L)

where

L = ÃÂ»abcdefghijklmnopqstuvwxyzr. (r (t h i s i s a f i x e d p o i n t c o m b i n a t o r))

Klop became a member of the Royal Netherlands Academy of Arts and Sciences in 2003. He died on 28 September 2025, at the age of 79.

Selected publications