We present criteria for comparing measurements on a given system from the point of view of the information they provide. These criteria lead to a concept of informational completeness of a set of observables, which generalizes the conventional concept of completeness. The entropy of a state with respect to an arbitrary sample space of potential measurement outcomes is defined, and then studied in the context of configuration space and fuzzy stochastic phase space.

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finishing his Ph.D. there in 1964. After spending an additional year in Princeton as research associate, he became Postdoctoral Fellow at the Theoretical Physics Institute in Edmonton, Canada. In 1967 he joined the University of Toronto, where he became Professor in 1975. He has written numerous articles on the mathematical foundations and methods in quantum mechanics, quantum field theory in flat and curved spacetime, and quantum gravity. He has published three monographs dealing with various aspects of this research:

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