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Full Idea
Some form of haecceitism is central to the Leibnizian metaphysic.
Gist of Idea
Leibniz is some form of haecceitist
Source
report of Gottfried Leibniz (Discourse on Metaphysics [1686], §8) by Cover,J/O'Leary-Hawthorne,J - Substance and Individuation in Leibniz 5.2.1
Book Ref
Cover,J/O'Leary-Hawthorne,J: 'Substance and Individuation in Leibniz' [CUP 1999], p.159
A Reaction
That is, there is some inner hallmark that individuates each thing (though they don't mean the Duns Scotus idea of a haecceity which has no qualities apart from the capacity to individuate). Leibniz thinks essences individuate.
Related Idea
Idea 13105 The laws-of-the-series plays a haecceitist role [Leibniz, by Cover/O'Leary-Hawthorne]