Discussion
What is a definite clause?
Answer: A
Definite clauses correspond exactly to rules with a single conclusion, and forward and backward chaining over them are sound, complete and run in linear time. Horn clauses allow zero or one positive literal, the extra case being the goal clause. Instantiation and provability are different notions. A restriction whose members are exactly the rules people naturally write is unusually convenient, and it explains why so many practical systems are built on it.
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