Toc: Content: Front Matter, Page iii Copyright, Page iv LIST OF CONTRIBUTORS, Pages vii-viii PREFACE, Pages ix-x THE MATHEMATICAL FOUNDATIONS OF QUANTUM THEORY, Pages 1-8, P.A.M. Dirac The “Past” and the “Delayed-Choice” Double-Slit Experiment, Pages 9-48, John Archibald Wheeler THE LORENTZ PARTICLES: A NEW MODEL FOR THE 1/2-SPIN PARTICLE AND THE HYDROGEN ATOM, Pages 49-58, Constantin Piron ORTHOMODULAR STRUCTURES AND PHYSICAL THEORY, Pages 59-69, A.R. MARLOW ANOTHER NONSTANDARD QUANTUM LOGIC (AND HOW I FOUND IT), Pages 71-85, Richard J. Greechie SOME UNSOLVED PROBLEMS IN QUANTUM LOGICS, Pages 87-103, S. Gudder MANUALS, MORPHISMS AND QUANTUM MECHANICS, Pages 105-126, D.J. Foulis, C.H. Randall LIMITS OF MANUALS AND LOGICS, Pages 127-152, Hans R. Fischer, Gottfried T. Rüttimann THE GEOMETRY OF THE STATE SPACE, Pages 153-176, Hans R. Fischer, Gottfried T. Rüttimann SPIN MANUALS EMPIRICAL LOGIC TALKS QUANTUM MECHANICS, Pages 177-254, Ron Wright THE STATE OF THE PENTAGON A NONCLASSICAL EXAMPLE, Pages 255-274, Ron Wright THE NIKODYM-HAHN-VITALE-SAKS THEOREM FOR STATES ON A QUANTUM LOGIC, Pages 275-286, Thurlow A. Cook ON GEOMETRIC QUANTIZATION OF CLASSICAL SYSTEMS, Pages 287-297, Jrzej Śniatycki MEASURES WITH MINIMUM UNCERTAINTY ON NON-COMMUTATIVE ALGEBRAS WITH APPLICATION TO MEASUREMENT THEORY IN QUANTUM MECHANICS, Pages 299-327, Franklin E. Schroeck Jr. DUALITY FOR C*-ALGEBRAS, Pages 329-338, Maurice J. Dupré GEOMETRODYNAMICS AS FOUNDATION OF PHYSICS, Pages 339-346, Maurice Dupré SPIN AND STATISTICS OF ELEMENTARY PARTICLES, Pages 347-349, Y.N. Kim QUANTUM MECHANICS WITH DENSITY OPERATORS, Pages 351-356, Steven M. Moore PURE STATES, MIXTURES AND COMPOUNDS, Pages 357-363, Asher Peres POSITION AND MOMENTUM DISTRIBUTIONS DO NOT DETERMINE THE QUANTUM MECHANICAL STATE, Pages 365-372, Andrew Vogt