Universalism entails Extensionalism

Analysis 69 (4):599-604 (2009)
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I argue that Universalism (the thesis that mereological composition is unrestricted) entails Extensionalism (the thesis that sameness of composition is sufficient for identity) as long as the parthood relation is transitive and satisfies the Weak Supplementation principle (to the effect that whenever a thing has a proper part, it has another part disjoint from the first).
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Parts: A Study in Ontology.Peter Simons - 1987 - Oxford University Press.
.Wiggins, David
Parts of Classes.LEWIS, David

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Non-Wellfounded Mereology.Cotnoir, Aaron J. & Bacon, Andrew

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