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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'). |