Ideas from 'Summula philosophiae naturalis' by William of Ockham [1320], by Theme Structure

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7. Existence / E. Categories / 5. Category Anti-Realism
Ockham was an anti-realist about the categories
                        Full Idea: Ockham is the scholastic paradigm of anti-realism with respect to the categories.
                        From: report of William of Ockham (Summula philosophiae naturalis [1320]) by Robert Pasnau - Metaphysical Themes 1274-1671 05.3
                        A reaction: These are the ten categories mentioned in Aristotle's book 'Categories'.
9. Objects / C. Structure of Objects / 4. Quantity of an Object
Ockham says matter must be extended, so we don't need Quantity
                        Full Idea: Ockham regards Quantity as an entirely superfluous ontological category, …because matter is intrinsically extended.
                        From: report of William of Ockham (Summula philosophiae naturalis [1320]) by Robert Pasnau - Metaphysical Themes 1274-1671 04.4
Matter gets its quantity from condensation and rarefaction, which is just local motion
                        Full Idea: Matter is made to have a greater or lesser quantity not through its receiving any absolute accident, but through condensation and rarefaction alone. Parts come more or less close together, which can happen with local motion.
                        From: William of Ockham (Summula philosophiae naturalis [1320], I.13), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 15.1
                        A reaction: This is Ockham at his most modern, rejecting the odd idea of Quantity in favour of a modern corpuscular view of the mere motions of matter.