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The effects in a quantum-mechanical system form a partial algebra and a partially ordered set which is the prototypical example of the effect algebras discussed in this paper. The relationships among… (More)

- David J. Foulis
- 1999

This expository paper comprises my personal response to the question in the title. Before giving my answers to this question, I discuss the utility of quantum logic in Section 2, offer a succinct… (More)

An orthoalgebra, which is a natural generalization of an orthomodular lattice or poset, may be viewed as a “logic” or “proposition system” and, under a welldefined set of circumstances, its elements… (More)

A generalized notion of a ``sample space'' is developed which allows for the simultaneous representation of the outcomes of a set of related ``random experiments.'' Affiliated with each such… (More)

The operational approach in the title of this paper refers to the primitive and fundamental status accorded to the concept of a physical experiment or operation by the authors. This emphasis on the… (More)

- David J. Foulis
- 1960

- David J. Foulis
- 1963

In orthodox quantum mechanics, it has virtually become the custom to identify properties of a physical system with operationally testable propositions about the system. The causes and consequences of… (More)

We study a general tensor product for two collections of related physical operations or observations. This is a free product, subject only to the condition that the operations in the first collection… (More)