This is very, very sad news. It was expected, but I really hoped he could recover. We were very good friends since the fantastic PSSL weekends where we met regularly. Thomas was a great mathematician, an especially good one because one could talk to him, argue even forcibly, but finally agreeing on how to resolve the argument. And he would suggest to go out for a beer after all that. We had many common interests, in mathematics and outside mathematics. I was really sorry he could not be at my retirement party last September. He wrote to me a few weeks later a very gentle and hopeful message to explain why he could not attend and was still so incredibly nice, so incredibly Thomas, to send me the slides he had prepared for the talk, addressing two open problems in topos theory and explain what he intended to say. Mathematics was part of his being, and it was a nice mathematics because it was Thomas's. His loss is clearly deeply felt by very many. I really miss him! My sincere condolences go to his wife Eva. Pino Rosolini ---------- You're receiving this message because you're a member of the Categories mailing list group from Macquarie University. Leave group: https://outlook.office365.com/owa/categories@mq.edu.au/groupsubscription.ashx?source=EscalatedMessage&action=leave&GuestId=6bf90c14-94d1-45b7-a0b5-9dd447734d27