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Conference paper

Deductive question answering

QA1 and QA2 derive answers from stored facts

Question answering combined stored facts, relevant retrieval, and deductions that were not explicitly stored.

C. Cordell Green and Bertram Raphael

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The contribution

QA1 placed facts and logical relationships in list-structured memory and used inference rules to derive answers. QA2 put a formal resolution theorem prover at the center of the question-answering system. The paper separated finding relevant information from deriving new answers, and explored how changing knowledge could avoid rewriting dedicated answering routines.

What this does not establish

These were early experimental systems using formal representations and limited examples. Their logical deductions did not establish unrestricted understanding of natural language.

Why this date?

1968 is the conference publication year shown in the original paper. SHRDLU reference 20 uses the label Green 1969b but identifies the 1968 proceedings.

This entry follows the linked publication. Read the source and date conventions.

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