I am deeply saddened by Pieter's passing. Pieter was one of my PhD advisors (along with Philip Scott) at the University of Ottawa from 2015-2020. I was also a TA for some of his classes on a few occasions. He was always very kind, respectful, and generous with his time and energy, and he was an insightful and encouraging teacher, mentor, and advisor. He had an immense impact on my development both as a mathematician and as a person. He will be deeply missed. I also send my condolences to his family, friends, and colleagues. -Jason Parker On Tue, May 3, 2022 at 2:46 PM Philip Scott <scpsg@uottawa.ca> wrote:
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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