Abstract
The purpose of this paper is to sketch an attack on the general problem of representing a composite physical system in terms of its constituent parts. For quantum-mechanical systems, this is traditionally accomplished by forming either direct sums or tensor products of the Hilbert spaces corresponding to the component systems. Here, a more general mathematical construction is given which includes the standard quantum-mechanical formalism as a special case.
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Dedicated to Professor Peter Mittelstaedt.
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Foulis, D.J. Coupled physical systems. Found Phys 19, 905–922 (1989). https://doi.org/10.1007/BF01889305
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DOI: https://doi.org/10.1007/BF01889305