Bottom up procedures to construct each minimal clause tree once
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1997
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Abstract
Bottom up procedures are introduced for constructing only minimal clause trees. Two general methods are proposed. The first performs surgery on each non-minimal clause tree; the second ignores non-minimal clause trees and retains only minimal ones. By ranking open leaves and activating/deactivating leaves according to the ranking, the second method constructs each minimal clause tree exactly once. Methods for incorporating subsumption are described and a prototype system for propositional logic is compared against OTTER.