Discussion
What is the relationship between first order logic and Prolog?
Answer: C
Prolog uses Horn clauses, depth first search with backtracking and negation as failure, which makes it fast and incomplete rather than a general prover. The restrictions are deliberate and are what make it a practical programming language. It adds no quantifiers and is certainly related. Recognising a language as a logic with a fixed proof strategy explains both its declarative reading and the places where that reading breaks down. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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