Quantum Mechanics, A Half Century Later: Papers of a Colloquium on Fifty Years of Quantum Mechanics, held at the University Louis Pasteur, Strasbourg, 2–4 May 1974 (Episteme 5)
Quantum Mechanics, A Half Century Later: Papers of a Colloquium on Fifty Years of Quantum Mechanics, held at the University Louis Pasteur, Strasbourg, 2–4 May 1974 (Episteme 5), N H March
Include the Observer in the Wave Function?.- On the Possible Connections between Quantum Mechanics and Gravitation.- The Quantum Probability Calculus.- Quantum Logics and Ideal Measurements of the First Kind.- A First Lecture on Quantum Mechanics.- Essay on the Development of the Statistical Theory of the Calculus of Probability.- The Quantum Mechanical One-System Formalism, Joint Probabilities and Locality.- On Propositions and Physical Systems.- Towards a Proper Quantum Theory.- On the Intuitive Understanding of Non-Locality as Implied by Quantum Theory.- Four Ideas of David Bohm on the Relationship between Quantum Mechanics and Relativity.- The Role of Quantum Mechanics in the Set-up of a Mathematical Government among Molecular Populations.- Hidden Parameters, Hidden Probabilities.- The Recent Attempts to Verify Quantum Mechanics.- Spin Correlation Measurement in Proton-Proton Scattering and Comparison with the Theories of the Local Hidden Variables.
In 1976, a conference called "Fifty Years of Quantum Mechanics" was held at the University of Louis Pasteur, Strasbourg. It was attended by more than a dozen physicists, including a young French scientist, Jean Marc Levy-Leblond. Wheeler's presentation was called, "Include the Observer in the Wave Function?'' Wheeler had a history of vacillating on Everett's theory, but now, 20 years after he had endorsed it in Reviews of Modern Physics, he rejected Everett's inclusion of the observer in the wave function, essentially upholding the Copenhagen interpretation. In 1977, Jean Marc Levy-Leblond wrote a letter to Everett, including a copy of a paper he had presented at the conference that compared DeWitt's and Everett's views. Everett responded by agreeing with Levy-Leblond's analysis of the differences between the two views. Everett especially liked the short spoof of foundational writing in physics (on "zipperdynamics'') that LeBlond had tacked onto the end of his paper. This document is the cover letter that Levy-Leblond sent with his paper.