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Ideas for 'After Finitude', 'Scientific Explanation' and 'The Metaphysics of Modality'

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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / a. Symbols of PL

12005	The symbol 'ι' forms definite descriptions; (ιx)F(x) says 'the x which is such that F(x)' [Forbes,G]
	Full Idea: We use the symbol 'ι' (Greek 'iota') to form definite descriptions, reading (ιx)F(x) as 'the x which is such that F(x)', or simply as 'the F'.
	From: Graeme Forbes (The Metaphysics of Modality [1985], 4.1)
	A reaction: Compare the lambda operator in modal logic, which picks out predicates from similar formulae.