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| CATEGORICAL LOGIC AND TYPE THEORY, 141
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By
B. Jacobs, Computing Science Institute, University of Nijmegen, The Netherlands
Included in series
Studies in Logic and the Foundations of Mathematics, 141
Description
This book is an attempt to give a systematic presentation of both logic and type theory from a categorical perspective, using the unifying
concept of fibred category. Its intended audience consists of logicians, type theorists, category theorists and (theoretical) computer
scientists.
Contents
Preface. Contents. Preliminaries. Prospectus.
Logic, type theory, and fibred category theory. The logic and type theory
of sets.
Introduction to fibred category theory.
Fibrations. Some concrete examples: sets, ω-sets and PERs. Some
general examples. Cloven and split fibrations. Change-of-base and composition for fibrations. Fibrations of signatures. Categories of
fibrations. Fibrewise structure and fibred adjunctions. Fibred products and coproducts. Indexed categories.
Simple type theory.
The basic calculus of types and terms. Functorial semantics. Exponents, products and coproducts. Semantics of simple type theories. Semantics
of the untyped lambda calculus as a corollary. Simple parameters.
Equational logic.
Logics. Specifications and theories
in equational logic. Algebraic specifications. Fibred equality. Fibrations for equational logic. Fibred functorial semantics.
First
order predicate logic.
Signatures, connectives and quantifiers. Fibrations for the first order predicate logic. Functorial interpretation
and internal language. Subobject fibrations I: regular categories. Subobject fibrations II: coherent categories and logoses. Subset types.
Quotient types. Quotient types, categorically. A logical characterisation of subobject fibrations.
Higher order predicate logic.
Higher order signatures. Generic objects. Fibrations for higher order logic. Elementary toposes. Colimits, powerobjects and well-poweredness
in topos. Nuclei in a topos. Separated objects and sheaves in a topos. A logical description of separated objects and sheaves.
The
effective topos.
Constructing a topos from a higher order fibration. The effective topos and its subcategories of sets, ω-sets,
and PERs. Families of PERs, and ω-sets over the effective topos. Natural numbers in the effective topos and some associated principles.
Internal category theory.
Definition and examples of internal categories. Internal functors and natural transformations.
Externalisation. Internal diagrams and completeness.
Polymorphic type theory.
Syntax. Use of polymorphic type theory.
Naive set theoretic semantics. Fibrations for polymorphic type theory. Small polymorphic fibrations. Logic over polymorphic type theory.
Advanced fibred category theory.
Opfibrations and fibred spans. Logical predicates and relations. Quantification. Category
theory over a fibration. Locally small fibrations. Definability.
First order dependent type theory.
A calculus of dependent
types. Use of dependent types. A term model. Display maps and comprehension categories. Closed comprehension categories. Domain theoretic
models of type dependency.
Higher order dependent type theory.
Dependent predicate logic. Dependent predicate logic,
categorically. Polymorphic dependent type theory. Strong and very strong sum and equality. Full higher order dependent type theory. Full
higher order dependent type theory, categorically. Completeness of the category of PERs in the effective topos.
References. Notation
index. Subject index.
| Bibliographic details |
Paperback, 780 pages, publication date: MAY-2001
ISBN-13: 978-0-444-50853-9
ISBN-10: 0-444-50853-8
Imprint: ELSEVIER
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USD 119
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Last update: 4 Sep 2009
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