Combining Philosophers

All the ideas for H.Putnam/P.Oppenheim, Jaakko Hintikka and Hilbert,D/Ackermann,W

expand these ideas     |    start again     |     specify just one area for these philosophers

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4 ideas

4. Formal Logic / C. Predicate Calculus PC / 1. Predicate Calculus PC

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The first clear proof of the consistency of the first order predicate logic was in 1928 [Hilbert/Ackermann, by Walicki]

7. Existence / D. Theories of Reality / 11. Ontological Commitment / a. Ontological commitment

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Our commitments are to an 'ontology', but also to an 'ideology', or conceptual system [Hintikka]

10. Modality / E. Possible worlds / 2. Nature of Possible Worlds / a. Nature of possible worlds

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Commitment to possible worlds is part of our ideology, not part of our ontology [Hintikka]

14. Science / D. Explanation / 2. Types of Explanation / j. Explanations by reduction

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Six reduction levels: groups, lives, cells, molecules, atoms, particles [Putnam/Oppenheim, by Watson]