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Match each technique with what it contributes.

List I

A. Unit propagation

B. Clause learning

C. Set of support

D. Subsumption

List II

P. forced assignments without search

Q. preventing a conflict recurring

R. restricting resolution to goal descendants

S. deleting redundant clauses

Select the correct match.

  • A.A-Q, B-P, C-S, D-R
  • B.A-R, B-S, C-P, D-Q
  • C.A-P, B-R, C-Q, D-S
  • D.A-P, B-Q, C-R, D-S

Answer: D

Two of these belong to propositional satisfiability and two to first order resolution, yet all four address the same underlying problem of keeping a combinatorial search tractable. Two restrict what is explored and two remove what has been shown useless, which is a classification worth carrying to any search procedure.

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