What an awful piece of news. During his PhD, Pieter visited Genova while I was there and he shared a flat above mine in the old town. He was not only a good neighbor but he also became a good friend indeed. If I remember correctly, he had a degree in Philosophy. His conversation was kind, clever and entertaining. We did not always agree on academic matters but I always tried to meet with him during the ct's to talk and recall our days in Italy under Pino's protection. Last time was at the Bow Bar in Edinburgh where we talked about his work with Jon and about how much he enjoyed being a father. M.
---------- Forwarded message --------- De: Philip Scott <scpsg@uottawa.ca> Date: mar., 3 de mayo de 2022 2:46 p. m. Subject: categories: Pieter Hofstra To: categories@mta.ca <categories@mta.ca> Cc: Philip Scott <philip.scott@uottawa.ca>
It is with great sadness that we announce that our dear friend and colleague Pieter Hofstra (1975-2022) passed away unexpectedly on May 1. Pieter obtained his PhD from Utrecht University, under Jaap van Oosten, studying realizability toposes. His research interests included general topos theory, realizability, inverse semigroups and groupoids, abstract computability, and homotopy type theory. Among his recent works, with J. Funk he introduced the notion of isotropy groups of toposes, which he was actively developing with students and colleagues.
While Pieter was a brilliant researcher, a kind teacher and a caring supervisor, we will most remember him as a friend. When we have any details for a memorial service, we will pass them along.
Richard Blute, Simon Henry, Philip Scott (University of Ottawa)
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