Unpublished lecture notes Kees Doets now available

Over several years Kees Doets, who died in November 2024 at the age of 83, was giving at the ILLC institute at the University of Amsterdam a course `Zermelo-Fraenkel Set Theory'. Kees was known for his elegant and lucid writing style. Thanks to Kees' family his unpublished lecture notes from this course are now available online at https://resources.illc.uva.nl/emeriti/Kees-Doets/Publicaties/. The notes deal with constructible sets, forcing, and iterated forcing and include more than 250 exercises, with selected solutions.