Combining Texts

Ideas for 'From an Ontological Point of View', 'The Metaphysics of Modality' and 'Against the Ethicists (one book)'

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2 ideas

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.

4. Formal Logic / F. Set Theory ST / 8. Critique of Set Theory

7035	God does not create the world, and then add the classes [Heil]
	Full Idea: It is hard to see classes as an 'addition of being'; God does not create the world, and then add the classes.
	From: John Heil (From an Ontological Point of View [2003], 13.4 n6)
	A reaction: This seems right. We may be tempted into believing in the reality of classes when considering maths, but it seems utterly implausible when considering trees or cows.