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Ideas for '', 'Possible Worlds' and 'A Tour through Mathematical Logic'

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3 ideas

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

11211

If a sound conclusion comes from two errors that cancel out, the path of the argument must matter [Rumfitt]

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

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In first-order logic syntactic and semantic consequence (|- and |=) nicely coincide [Wolf,RS]

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First-order logic is weakly complete (valid sentences are provable); we can't prove every sentence or its negation [Wolf,RS]