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It is with great sadness that the SIGLOG community learned of the passing away of Philip J. Scott in December 2023. He was a leader of the community and made major contributions to type theory, polymorphic λ -calculus, bounded linear logic, Geometry of Interaction and many other topics. He and Jim Lambek wrote the classic textbook, "Introduction to Higher-order Categorical Logic" which exposed the computer science community to what were then exotic topics for us: type theory and categories, categorical proof theory and toposes.
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Prakash Panangaden (2024) studied this question.
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