Typed Lambda Calculi and Applications : 4th International Conference TLCA’99 L’Aquila Italy April 7–9 1999 Proceedings This book constitutes the refereed proceedings of the 4th International Conference on Typed Lambda Calculi and Applications TLCA99 held in LAquila Italy in April 1999. The 25 revised full papers presented were carefully reviewed and selected from a total of 50 submissions. Also included are two invited demonstrations. The volume reports research results on various aspects of typed lambda calculi. Among the topics addressed are noncommutative logics type theory algebraic data types logical calculi abstract data types and subtyping