Ideas of John Duns Scotus, by Theme

[Scottish, 1266 - 1308, Born at Duns, Scotland. Taught at the University of Paris. Known as 'Doctor Subtilis'.]

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7. Existence / A. Nature of Existence / 8. Criterion for Existence
Are things distinct if they are both separate, or if only one of them can be separate?
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 only the singular exists, science is impossible, as that relies on true generalities
If things were singular they would only differ numerically, but horse and tulip differ more than that
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 / a. Intrinsic unification
'Unity' is a particularly difficult word, because things can have hidden unity
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 / B. Unity of Objects / 2. Substance / a. Substance
Substance is only grasped under the general heading of 'being'
Substance is an intrinsic thing, so parts of substances can't also be intrinsic things
9. Objects / C. Structure of Objects / 2. Hylomorphism / d. Form as unifier
Matter and form give true unity; subject and accident is just unity 'per accidens'
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