Discussion
What does first order logic add to propositional logic?
Answer: B
First order logic commits to a world of objects with properties and relations, and permits quantification over those objects, so a general statement need be made only once. Implication exists in both, decidability is lost rather than gained, and the truth values are unchanged. Gaining the ability to say something about every object of a kind, at the cost of decidability, is the central trade the step upward involves.
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