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Ideas for 'Parmenides', 'Philosophy of Mathematics' and 'An essentialist approach to Truth-making'

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5. Theory of Logic / A. Overview of Logic / 5. First-Order Logic

18109

The completeness of first-order logic implies its compactness [Bostock]

18108

First-order logic is not decidable: there is no test of whether any formula is valid [Bostock]