Universalism entails Extensionalism

Analysis 69 (4):599-604 (2009)
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).
Keywords Mereology  Mereological Universalism  Mereological Extensionality
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DOI 10.2307/40607775
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PhilPapers Archive Achille C. Varzi, Universalism entails Extensionalism
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References found in this work BETA
Paul Hovda (2009). What Is Classical Mereology? Journal of Philosophical Logic 38 (1):55 - 82.
Donald Smith (2009). Mereology Without Weak Supplementation. Australasian Journal of Philosophy 87 (3):505 – 511.

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