This book constitutes the thoroughly refereed post-workshop proceedings of the Third International Workshop, TYPES'99, organized by the ESPRIT Working Group 21900, in Lökeberg, Sweden, in June 1999.The 11 revised full papers presented in the volume were carefully reviewed and selected during two rounds of refereeing. All current issues on type theory and type systems and their applications to programming and proof theory are addressed.

This book presents a strictly refereed collection of revised full papers selected from the papers accepted for the TYPES '94 Workshop, held under the auspices of the ESPRIT Basic Research Action 6453 Types for Proofs and Programs in Bastad, Sweden, in June 1994.
The 10 papers included address various aspects of developing computer-assisted proofs and programs using a logical framework. Type theory and three logical frameworks based on it are dealt with: ALF, Coq, and LEGO; other topics covered are metatheory, the Isabelle system, 2-calculus, proof checkers, and ZF set theory.

This book presents the proceedings of the Sixth International Conference on Category Theory and Computer Science, CTCS '95, held in Cambridge, UK in August 1995.The 15 revised full papers included in the volume document the exploitation of links between logic and category theory leading to a solid basis for much of the understanding of the semantics of computation. Notable amongst other advances is the introduction of linear logic and other substructural logics, providing a new approach to proof theory. Further aspects covered are semantics of lambda calculi and type theories, program specification and development, and domain theory.