Synthese 41 (1):37 - 63 (
1979)
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Abstract
Part of an early version of this paper was read at the University of Warwick in October 1977, and a later version was read at the Newcastle Royal Institute of Philosophy in November 1977 and at Aberystwyth and Oxford in early 1978. Thanks are due to the many colleagues and friends who made helpful comments on early drafts; special thanks to Hugh Mellor, Rita Nolan and Paul Weiss for detailed written criticisms, and to Don Locke, for very helpful discussions.