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Single Idea 21719

[filed under theme 5. Theory of Logic / I. Semantics of Logic / 5. Extensionalism ]

Full Idea

With the principle of extensionality anything true of one propositional functions will be true of every coextensive one.

Gist of Idea

Extensionalism means what is true of a function is true of coextensive functions

Source

Bernard Linsky (Russell's Metaphysical Logic [1999], 6.3)

Book Ref

Linsky,Bernard: 'Russell's Metaphysical Logic' [CSLI 1999], p.97