Ideas from 'Ordinatio' by John Duns Scotus [1302], by Theme Structure

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8. Modes of Existence / B. Properties / 1. Nature of Properties
Accidents must have formal being, if they are principles of real action, and of mental action and thought
8. Modes of Existence / E. Nominalism / 1. Nominalism / a. Nominalism
If things were singular they would only differ numerically, but horse and tulip differ more than that
If only the singular exists, science is impossible, as that relies on true generalities
9. Objects / A. Existence of Objects / 4. Individuation / a. Individuation
We distinguish one thing from another by contradiction, because this is, and that is not
9. Objects / A. Existence of Objects / 4. Individuation / d. Individuation by haecceity
The haecceity is the featureless thing which gives ultimate individuality to a substance
9. Objects / B. Unity of Objects / 1. Unifying an Object / b. Unifying aggregates
It is absurd that there is no difference between a genuinely unified thing, and a mere aggregate
9. Objects / C. Structure of Objects / 8. Parts of Objects / c. Wholes from parts
What prevents a stone from being divided into parts which are still the stone?
9. Objects / F. Identity among Objects / 8. Leibniz's Law
Two things are different if something is true of one and not of the other