Technical Reports

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UBC CS TR-91-01 Summary

Revision in ACMS, April 1991 Alex Kean, 19 pages

The motivation for creating truth maintenance systems is two fold. First, it is used for the abduction process of generating explanation; and second, to perform the necessary {\em bookkeeping} of revision of the knowledge based. The process of revision is defined as addition and deletion of knowledge from the knowledge base. A logical scheme for tracking conclusions in an assumption based clause management system (ACMS) for the purpose of abduction and revision is proposed. As a consequence, an incremental deletion scheme is derived. A protocol for assumption revision is demonstrated by a backtrack search example. The proposed ACMS is the first truth maintenance system that employs incremental deletion as part of its capability.


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