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Foundations of Deductive Databases and Logic Programming
book

Foundations of Deductive Databases and Logic Programming

by Jack Minker
May 2014
Intermediate to advanced content levelIntermediate to advanced
752 pages
35h 3m
English
Morgan Kaufmann
Content preview from Foundations of Deductive Databases and Logic Programming
Chapter
4:
Declarative Semantics of Logic Programs 187
(i) If a predicate ρ occurs in P. then its definition is contained within
(ii) If a predicate ρ occurs in P
(
underι then its definition is contained
within \J
j<i
P
r
(The definition of ρ is the subset of Ρ consisting of all clauses containing ρ on
the left.) A program has a stratification iff it is stratified (Apt, Blair, and
Walker [1988], Lemma 1).
Consider now a stratification (19) of a program P. For every i = Ι,.,.,η, let
T
i
be the operator on Herbrand models (i.e., on sets of ground atoms) defined
as follows: for every Herbrand model M and every ground atom A, A Ε TfM)
iff Α Ε M or ...
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Publisher Resources

ISBN: 9781483221120