2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56100Some of the consequences of Eyvind Wichmann's contributions to modular theory and the QFT phase-space structure are presented. In order to show the power of those ideas in contemporary problems, I selected the issue of algebraic holography as well as a new nonperturbative constructive approach (based on the modular structur of wedge-localized algebras and modular inclusions) and show that these ideas are recent consequences of the pathbreaking work which Wichmann together with his collaborator Bisognano initiated in the mid 70$^{ies}.A rogue address which entered chapter 2 has since been omitted. 21 pages, tcilatex, to be published in a special Festschrift volume, dedicated to Prof. E. Wichmann on the occasion of his seventieth birthdayHigh Energy Physics - TheoryGeneral Relativity and Quantum CosmologyMathematical Physicstext