Quantum kinematics and dynamics

"A preliminary and incomplete version of part A was used as the basis of lectures delivered in July, 1955 at the Les Houches Summer School of Theoretical Physics. Work on part A ceased later that year and part B was never begun. Several years after, I used some of the material in a series of notes published in the Proceedings of the National Academy of Sciences. And there the matter rested until, quite recently, Robert Kohler (State University of Buffalo) reminded me of the continuing utility of the Les Houches notes and suggested their publication. He also volunteered to assist in this process. Here is the result. The main text is the original and still incomplete 1955 manuscript, modified only by the addition of subheadings. To it is appended excerpts from the Proc. Nat. Acad. of Sciences articles that supplement the text, together with two papers that illustrate and further develop its methods."