Hyperfunctions and Theoretical Physics : Rencontre de Nice 21–30 Mai 1973 aux hyperfonctions Pseudo differential operators acting on the sheaf of microfunctions Micro hyperbolic pseudo differential operators Microanalyticite de la matrice S Macrocausality physical region analyticity and independence property in S matrix theory Appendix Microlocal essential support of a distribution and decomposition theorems — An introduction Unitarity and discontinuity formulae Geometry of the N point P space function of quantum field theory Some applications of the Jost Lehmann Dyson theorem to the study of the global analytic structure of the N point function of quantum field theory Quelques aspects globaux des problemes dedge of the wedge.