Abstract:
This report is based on the Lectures of Hagedorn, the visiting Professor at IMSc., during Nov.1963 - Jan. 1964). Notes prepared by T. S. Santhanam and K. Ananthanarayanan. In turn these lectures are based on the contents of the book, "Relativistic Kinematics", of the author, published by W.A. Benjamin INC., New York during 1963.