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
9. Objects / C. Structure of Objects / 4. Quantity of an Object
Ockham says matter must be extended, so we don't need Quantity
Matter gets its quantity from condensation and rarefaction, which is just local motion