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prostatitis

Soundness and Completeness Results II,lete by appealing to the completeness of the ground method and the Skolen-Herbrand-Gödel theorem. The material on congruences associated with sets of Horn clauses was first developed by Gallier in [24], where he used it to define fast two algorithms which test the unsatisfiability of ground sets of

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https://doi.org/10.1057/9780230597693 shown to be unsatisfiable, or if it can no longer be expanded, in which case the query formula is shown to be refutable. The process may also enter into a non-terminating sequence of expansion steps. The algorithm that checks for unsatisfiability is not a resolution method, and has the property tha

atopic

ticlopidine

虚弱

HILAR

Plaque

An Equational Extension,,.) is defined by an .+1-ary predicate .(..,..., .., ..) which “collects” the value in the . + 1. argument. In order for Prolog to reason equationally, rules for rewriting one term to another must be expressed via a distinguished predicate (say .).

馆长

The ,, Refutation Method,ith equality, in order to reduce unsatisfiability in the first-order case to unsatisfiability in the ground case. Recall that this theorem states that a set of universal prenex sentences is unsatisfiable if and only if some set of ground substitution instances of the matrices of these sentences is unsatisfiable.

混杂人

真实的人

https://doi.org/10.1007/978-1-4419-7479-2efinite clauses as integrity constraints, and the class of negative clauses as the query language. This interpretation is a generalization of the standard relational model because it allows recursion among the relations, and has given rise to the idea of a deductive database [23].