Guarded horn clauses - definizione. Che cos'è Guarded horn clauses
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Cosa (chi) è Guarded horn clauses - definizione

CLAUSE (A DISJUNCTION OF LITERALS) WITH AT MOST ONE POSITIVE, I.E. UNNEGATED, LITERAL
Horn logic; Definite clause; Horn sentence; Horn clauses; Dual-Horn clause; Horn formula; Universal Horn theory; Horn Logic

Guarded Horn Clauses      
<language> (GHC) A parallel dialect of Prolog by K. Ueda in which each clause has a guard. GHC is similar to Parlog. When several clauses match a goal, their guards are evaluated in parallel and the first clause whose guard is found to be true is used and others are rejected. It uses committed-choice nondeterminism. See also FGHC, KL1. (1995-05-09)
definite clause         
<logic> A Horn clause that has exactly one {positive literal}. (2000-01-24)
Horn clause         
<logic> A set of atomic literals with at most one {positive literal}. Usually written L < - L1, ..., Ln or < - L1, ..., Ln where n >= 0, " < - " means "is implied by" and comma stands for conjuction ("AND"). If L is false the clause is regarded as a goal. Horn clauses can express a subset of statements of first order logic. The name "Horn Clause" comes from the logician Alfred Horn, who first pointed out the significance of such clauses in 1951, in the article "On sentences which are true of direct unions of algebras", Journal of Symbolic Logic, 16, 14-21. A definite clause is a Horn clause that has exactly one positive literal. (2000-01-24)

Wikipedia

Horn clause

In mathematical logic and logic programming, a Horn clause is a logical formula of a particular rule-like form which gives it useful properties for use in logic programming, formal specification, and model theory. Horn clauses are named for the logician Alfred Horn, who first pointed out their significance in 1951.