Circumscribing with Sets

  title={Circumscribing with Sets},
  author={Donald Perlis},
  journal={Artif. Intell.},
Sets can play an important role in circumscription’s ability to deal in a general way with certain aspects of commonsense reasoning. A result of Kueker indicates that sentences that intuitively one would want circumscription to prove, are nonetheless not so provable in a formal setting devoid of sets. Furthermore, when sets are introduced, first-order circumscription handles these cases very easily, obviating the need for second-order circumscription. The Aussonderungs axiom of ZF set theory… CONTINUE READING