Combining Texts

Ideas for 'Lectures on the Philosophy of Right', 'The Foundations of Mathematics' and 'Russell's Metaphysical Logic'

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4 ideas

5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic

13427

Either 'a = b' vacuously names the same thing, or absurdly names different things [Ramsey]

5. Theory of Logic / F. Referring in Logic / 2. Descriptions / c. Theory of definite descriptions

21727

Definite descriptions theory eliminates the King of France, but not the Queen of England [Linsky,B]

5. Theory of Logic / I. Semantics of Logic / 5. Extensionalism

21719

Extensionalism means what is true of a function is true of coextensive functions [Linsky,B]

5. Theory of Logic / L. Paradox / 1. Paradox

13334

Contradictions are either purely logical or mathematical, or they involved thought and language [Ramsey]