5.4 Establishing Term Equivalence
We have extended earlier Constraints-based work
The somewhat surprising condition that emerged
through the method of question inversion. The ap-
from this effort was the need for a much more com-
proach uses our QA system recursively, by taking
plete ability than had previously been recognized for
candidate answers and attempts to validate them
the system to establish the equivalence of two terms.
through asking the inverted questions. The outcome
Redundancy has always played a large role in QA
is a re-ranking of the candidate answers, with the
Lenat, D. 1995. "Cyc: A Large-Scale Investment in
possible insertion of nil (no answer in corpus) as the
Knowledge Infrastructure." Communications of
top answer.
the ACM 38, no. 11.
Miller, G. “WordNet: A Lexical Database for Eng-
While we believe the approach is general, and can
lish”, Communications of the ACM 38(11) pp.
work on any question and arbitrary candidate lists,
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