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Petr Hájek
* 6 Feb 1940
+ 26 Dec 2016

Memorial page: http://www.ustavinformatiky.cz/petrhajek/

Petr Hájek was a renowned Czech mathematical logician with a
professional record that spans more than half a century. His work
leaves a permanent imprint in all of his research areas: set theory,
arithmetic, fuzzy logic and reasoning under uncertainty, and
information retrieval; some of his results enjoyed successful
applications. Throughout his career, he worked at the Czech Academy of
Sciences, starting as a postgraduate student at the Institute of
Mathematics in 1962. During 1992-2000, he served as director of the
Institute of Computer Science; he eventually became an emeritus
scholar of the Academy.

Petr Hájek (co-)authored seven books, more than 350 research papers,
textbooks and popular articles; his works are frequently cited with
the number of citations amounting to 3000. He taught logic at the
Faculty of Mathematics and Physics, Charles University in Prague,
where he was appointed full professor in 1997, and at the Faculty of
Nuclear Sciences and Physical Engineering, Czech Technical University.
He also taught at the Vienna University of Technology, where he was
appointed honorary professor in 1994. For the timespan of four
decades, he would run a weekly seminar of applied mathematical logic,
and he co-founded another seminar on mathematical logic at the
Institute of Mathematics.

He served as a member of committees and editorial boards and was a
long-time member of the Union of Czech Mathematicians and Physicists.
>From 1993 he was a member of the Association for Symbolic Logic.
During 1999 to 2003, and 2009 to 2015, he was the President of Kurt
Gödel Society. From 1996 he was a member of the Learned Society of the
Czech Republic. During 1993 to 2005 he was a member of the Scientific
Council of the Academy of Sciences of the Czech Republic. His awards
include the Bolzano medal from the Academy of Sciences in 2000, a
medal of the Minister of Education of the Czech Republic in 2002, the
"De scientiae et humanitate optime meritis" medal from the Academy of
Sciences in 2006, the Medal of Merit from the President of the Czech
Republic in 2006, and the Josef Hlávka medal in 2009.

Apart from the pursuit of mathematics, Petr Hájek was an organist. He
graduated from the Academy of Performing Arts in Prague and was, for a
considerable period of time, organist on Sundays at the protestant St.
Clemens Church in Prague; since childhood years he was a member of the
Evangelical Church of Czech Brethren.

Petr Hájek was married, with two children and a grandson. He was
fluent in several languages, including German, English, and Polish.
Generally appreciated as a friendly and modest person, known for his
readiness to help and listen to others, many colleagues considered him
their teacher and mentor. He was respected for his principles, not
least among these, his stands during the communist era, when he would
not enter the communist party nor cooperate with the state security
when asked to. For that reason, for considerable periods of time he
had been prevented from advancing his career or travelling abroad.

Petr Hájek will be remembered by his colleagues, friends and students
across continents for his contributions to mathematical logic and for
his friendliness, honesty, and fortitude.

The funeral service will be held at St. Clemens church, Klimentská
street, Prague 1, on January 14 at 2 p.m. A remembrance assembly will
follow immediately at the Institute of Computer Science, Pod
Vodárenskou vezí 2, Prague 8.

Condolence messages can be sent to [email protected] or privately to his
family to [email protected].

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