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"In 1999, a conference in honor of his 70th birthday was held at DIMACS" He was 68 in 1999. The real reason was: "During the summer of 1999, Andras Hajnal was diagnosed with lung cancer. In order to provide Andras with a pleasant weekend in the midst of is treatment, it was decided that and international conference on Set Theory should be organized in his honour." — Preceding unsigned comment added by 18.104.22.168 (talk) 15:51, 12 January 2013 (UTC)