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- Peter Aczel, Michael Barlow, Charles Albert, Elizabeth Bates, Inge Brether-Ton, Lynn Snyder +11 others
- 2002

Books listed below that are marked with a "t will be reviewed in a future issue. Readers who wish to review books for the journal should write, outlining their qualifications, to: Graeme Hirst, book review editor,ously, we cannot promise the availability ol." books in anyone's exact area of interest. Authors and publishers who wish their books to be… (More)

Inÿnite trees form a free completely iterative theory over any given signature—this fact, proved by Elgot, Bloom and Tindell, turns out to be a special case of a much more general categorical result exhibited in the present paper. We prove that whenever an endofunctor H of a category has ÿnal coalgebras for all functors H () + X , then those coalgebras, TX… (More)

- Peter Aczel
- TYPES
- 1998

Introduction The original motivation 1 for the work described in this paper was to determine the proof theoretic strength of the type theories implemented in the proof development systems Lego and Coq, Luo and Pollack 92, Barras et al 96]. These type theories combine the impredicative type of propositions 2 , from the calculus of constructions, Coquand 90],… (More)

We present a generalisation of the type-theoretic interpretation of constructive set theory into Martin-Löf type theory. The original interpretation treated logic in Martin-Löf type theory via the propositions-as-types interpretation. The generalisation involves replacing Martin-Löf type theory with a new type theory in which logic is treated as primitive.… (More)

- Peter Aczel
- MFPS
- 1993

We describe the nal universe approach to the character-isation of semantic universes and illustrate it by giving char-acterisations of the universes of CCS and CSP processes.

We introduce logic-enriched intuitionistic type theories, that extend intuitionistic dependent type theories with primitive judgements to express logic. By adding type theoretic rules that correspond to the collection axiom schemes of the constructive set theory CZF we obtain a generalisation of the type theoretic interpretation of CZF. Suitable… (More)