Manuscript related to the celebration of the 50th anniversary of the theory of the relativity.

Lecture notes taken by Josef Jauch, while a student at the ETH (Eidgenössische Technische Hochschule) Zürich. A transcription of the German shorthand used in these notes has been provided by Werner Amrein. The original documents are part of the Jauch Archive, held at the Department of Theoretical Physics, University of Geneva, and are reproduced by permission of the University.

Manuscript on the regular represntation of Lorentz goups.

Manuscript on probability.

Reflection on theory and experiment. Preparation for the 3rd Zurich talks.

Introduction: "In this paper a relativistic formalism is given for particles of arbitrary spin which resembles that of Dirac and Kemmer for spins 0, 1/2, and 1 [...].

Quantized Space-Time; Lorentz invariant discrete space-time.

Letter on "Quantised Fields Theories and the principle of Reciprocity".