This title constitutes the refereed proceedings of the 4th International Conference on Foundations of Software Science and Computation Structures, FOSSACS 2001. The 25 revised full papers, presented together with an invited paper and a tool presentation paper, were carefully reviewed and selected from a total of 63 submissions. Among the topics covered are algebraic, categorical, logical, and geometric theories, models, and methods supporting the specification, synthesis, verification, analysis, and transformation of sequential, concurrent, distributed and mobile programs and software...

One of the ?rst Computer Science sites in Italy, in recent years, the Friuli region has become a very active hub in Computational Physics and other applications of Informatics to Human and Natural Sciences. In particular the University of Udine has developed a tradition in innovative cross-disciplinary research areas involving Computer Science and Physics, providing digital tools for laboratories such as NASA and CERN. The sixth International Symposium Frontiers of Fundamental and Compu- tional Physics (FFP6) aimed at providing a platform for a wide range of phy- cists to meet and share...