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2 ideas
10930 | Quantification into modal contexts requires objects to have an essence [Quine] |
Full Idea: A reversion to Aristotelian essentialism is required if quantification into modal contexts is to be insisted on. An object must be seen as having some of its traits necessarily. | |
From: Willard Quine (Reference and Modality [1953], §3) | |
A reaction: This thought leads directly to Kripke's proposal of rigid designation of objects (and Lewis response of counterparts), which really gets modal logic off the ground. Quine's challenge remains - the modal logic entails a huge metaphysical commitment. |
489 | Each thing must be in some way unique [Diogenes of Apollonia] |
Full Idea: No one thing among things subject to change can possibly be exactly like any other thing, without becoming the same thing. | |
From: Diogenes (Apoll) (fragments/reports [c.440 BCE], B05), quoted by Simplicius - On Aristotle's 'Physics' 153.8 | |
A reaction: This is said to be the first ever formulation of the principle of identity of indiscernible. |