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Ideas for 'Mind and Its Place in Nature', 'Disquisitions' and 'Philosophy of Mathematics'
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5. Theory of Logic / A. Overview of Logic / 5. First-Order Logic
18108
First-order logic is not decidable: there is no test of whether any formula is valid
[Bostock]
18109
The completeness of first-order logic implies its compactness
[Bostock]