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Single Idea 11064

[from 'Mathematical logic and theory of types' by Bertrand Russell, in 4. Formal Logic / F. Set Theory ST / 8. Critique of Set Theory ]

Full Idea

Russell held that classes can be reduced to propositional functions.

Gist of Idea

Classes can be reduced to propositional functions

Source

report of Bertrand Russell (Mathematical logic and theory of types [1908]) by Robert Hanna - Rationality and Logic 2.4

Book Reference

Hanna,Robert: 'Rationality and Logic' [MIT 2006], p.38


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').