4.6 Article

Why I am not an Anti-Haecceitist

Journal

SYNTHESE
Volume 201, Issue 2, Pages -

Publisher

SPRINGER
DOI: 10.1007/s11229-022-04029-7

Keywords

Haecceitism; Identity of indiscernibles; Metaphysics of identity; Possible worlds

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The paper argues that if the Identity of Indiscernibles is not necessarily true, then Haecceitism ensues. The argument has implications for the tenability of philosophical positions, such as Generalism, and provides a strong argument for Haecceitism. The paper is structured to introduce Haecceitism and the Identity of Indiscernibles, present the main argument, and discuss implications.
In this paper I argue that if the Identity of Indiscernibles is not necessarily true, then Haecceitism ensues-where Haecceitism is the view that there are maximal possibilities that include all the same qualitative possibilities, and yet differ with respect to the non-qualitative possibilities they include. This goes against the common intuition that Anti-Haecceitism is compatible with the Identity of Indiscernibles being only contingently true. My argument is interesting in many respects. First, it shows that in any modal framework there is a connection between the number of worldbound ordinary spatio-temporal objects, and the number of overall possibilities. Second, it has repercussions for the tenability of some philosophical positions, like Generalism, which is usually interpreted as entailing Anti-Haecceitism while at the same time being compatible with the claim that the Identity of Indiscernibles is not necessarily true. If I am correct, Generalism and similar philosophical accounts turn out to be inconsistent. Finally, it provides a strong argument for Haecceitism, given that the majority of authors today find counterexamples to the Identity of Indiscernibles extremely convincing, and many philosophical positions have been and continue being criticised on the basis of their commitment to the Identity of Indiscernibles. The paper is structured as follows: I introduce Haecceitism and the Identity of Indiscernibles in Sects. 1 and 2 respectively. Drawing on a result from the Philosophy of Quantum Mechanics, which I survey in Sect. 3, I give my main argument in Sect. 4. Finally, I discuss some implications in Sect. 5.

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