Combining Philosophers

Ideas for H.Putnam/P.Oppenheim, Alan Musgrave and Brian Ellis

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6 ideas

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

12666

We can base logic on acceptability, and abandon the Fregean account by truth-preservation [Ellis]

5. Theory of Logic / C. Ontology of Logic / 3. If-Thenism

10061

The If-thenist view only seems to work for the axiomatised portions of mathematics [Musgrave]

10065

Perhaps If-thenism survives in mathematics if we stick to first-order logic [Musgrave]

5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth

10049

Logical truths may contain non-logical notions, as in 'all men are men' [Musgrave]

10050

A statement is logically true if it comes out true in all interpretations in all (non-empty) domains [Musgrave]

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

13606

Humean conceptions of reality drive the adoption of extensional logic [Ellis]