• Computer Science
  • Published 2005

Homomorphism Proof Systems for Unsatisfiable Formulas

  title={Homomorphism Proof Systems for Unsatisfiable Formulas},
  author={Xu Dao},
A homomorphism ? of CNF formulas from H to F is a function mapping the set of literals in H to the set of literals in F and it preserves complements and clauses. If the formula H is homomorphic to the formula F, then the unsatisfiability of H implies the unsatisfiability of F. A CNF formula F is minimally unsatisfiable if F is unsatisfiable and the resulting formula deleting any one clause from F is satisfiable. MU(1) is a class of minimally unsatisfiable formulas with the deficiency of the… CONTINUE READING

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