Discussion
What is a fact in a knowledge base?
Answer: C
Facts are the sentences put into the knowledge base directly, as distinct from the conclusions a reasoner derives from them. Whether they are true of the world is beyond the system's reach and is the responsibility of whoever supplied them. Verification and irrefutability are different notions. Keeping the asserted and the derived clearly apart is what allows a conclusion to be traced back to its premises when it turns out to be wrong.
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