History and Philosophy of Constructive Type Theory

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The book offers an in-depth examination of Martin-Löf's constructive type theory, detailing its evolution from 1970 to 1995 across eight distinct stages. Sommaruga highlights previously unpublished aspects of the theory, including a comprehensive account of its latest version presented at Leiden University in 1993. The work addresses significant issues concerning the type-theoretical approach to logic and the foundations of mathematics, which were overlooked in earlier brief presentations, thus providing a more complete understanding of the subject.