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Ideas for 'works', 'Identity in Substances and True Propositions' and 'Mathematical logic and theory of types'

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

11064	Classes can be reduced to propositional functions [Russell, by Hanna]
	Full Idea: Russell held that classes can be reduced to propositional functions.
	From: report of Bertrand Russell (Mathematical logic and theory of types [1908]) by Robert Hanna - Rationality and Logic 2.4
	A reaction: The exact nature of a propositional function is disputed amongst Russell scholars (though it is roughly an open sentence of the form 'x is red').