In this entry, ‘category’ is employed in the philosophical sense only and neither in the mathematical sense of category theory nor in the grammatical sense of syntactic category. There is also an everyday sense of ‘category’ in which it means any class in a classification; this is too unspecific to discuss here.
1 Aristotle, (1963), Categories and De interpretatione, Oxford: Clarendon Press.
2 Baumgartner, W. and P. Simons, (1994), “Brentano’s Mereology”, Axiomathes 5: 55–76.
3 Husserl, E., (1970), Logical Investigations, London: Routledge & Kegan Paul.
4 Ingarden, R., (1964), Time and Modes of Being, Springfield: Thomas.
5 Lowe, E. J., (2006), The Four Category Ontology: A Metaphysical Foundation for Natural Science, Oxford: Oxford University Press.