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

3809	If complex logic requires rules, then so does basic logic [Searle]

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

13534

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

13535

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