By Jean-Marc Andreoli (auth.), Jean-Yves Girard (eds.)
This booklet constitutes the refereed lawsuits of the 4th foreign convention on Typed Lambda Calculi and purposes, TLCA'99, held in L'Aquila, Italy in April 1999. The 25 revised complete papers awarded have been conscientiously reviewed and chosen from a complete of fifty submissions. additionally integrated are invited demonstrations. the amount stories study effects on numerous elements of typed lambda calculi. one of the issues addressed are noncommutative logics, sort thought, algebraic information forms, logical calculi, summary info forms, and subtyping.