I have returned to Amsterdam for the week. I did my sabbatical in
Amsterdam seven years ago and I always enjoy the visit. Yesterday I
saw the soccer team Amsterdam Ajax beat NEC (the team from
Nijmegen, not my previous employer). Today I am visiting
CWI, the Dutch math and computer science
institute in the group of Harry Buhrman (my most prolific co-author)
and Paul Vitányi (who co-wrote
the book on
Kolmogorov complexity).
Also visiting CWI is Kolya Vereshchagin from Moscow. I had an
interesting idea about Kolmogorov complexity but Vereshchagin had the
same idea weeks ago. Hate when that happens.
Tomorrow is Hein Röhrig's
Ph.D. defense. Hein always wanted me to mention him in this weblog
having mentioned both of his officemates,
John
Tromp and Ronald
de Wolf, before. So here is my
graduation present to Hein.
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