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http://cogsci.soton.ac.uk/~harnad/Papers/Harnad/harnad87.categorization.html
Online text of a chapter by Stevan Harnad in "Categorical Perception: The Groundwork of Cognition".
http://www.sorites.org/Issue_01/item05.htm
In this article Axel Mueller applies some reflections upon Goodman's paradox to the problem of natural kinds.
http://plato.stanford.edu/entries/properties/
Entry in the Stanford Encyclopaedia of Philosophy by Chris Swoyer. Principally concerned with existence and identity conditions.
Home > Society > Philosophy > Philosophy of Logic > Logic and Ontology > Natural Kinds
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