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 / 7. Criterion for Existence
Are things distinct if they are both separate, or if only one of them can be separate? [Pasnau]
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 [Panaccio]
If only the singular exists, science is impossible, as that relies on true generalities [Panaccio]
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 [Cover/O'Leary-Hawthorne]
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 an intrinsic thing, so parts of substances can't also be intrinsic things
Substance is only grasped under the general heading of 'being'
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