Computer Science Logic : 15th International Workshop CSL 2001 10th Annual Conference of the EACSL Paris France September 10–13 2001 Proceedings This book constitutes the refereed proceedings of the 15th International Workshop on Computer Science Logic CSL 2001 held as the 10th Annual Conerence of the EACSL in Paris France in September 2001.The 39 revised full papers presented together with two invited papers were carefully reviewed and selected from 91 submissions. The papers are organized in topical sections on linear logic descriptive complexity semantics higher order programs model logics verification automata lambda calculus induction equational calculus and constructive theory of types