Combining Philosophers

Ideas for H.Putnam/P.Oppenheim, Shaughan Lavine and Tim Crane

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3 ideas

5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic

15926

Second-order logic presupposes a set of relations already fixed by the first-order domain [Lavine]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

15934

Mathematical proof by contradiction needs the law of excluded middle [Lavine]

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

4098	The theory of descriptions supports internalism, since they are thinkable when the object is non-existent [Crane]