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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
Shepherdson
It is worth noting also that these nice properties of Horn clauses all depend
on an asymmetry in the treatment of positive and negative information: in the
closed world assumption a ground atom is supposed false unless it can be
proved true; in a generic model it is ground atoms (not their negations) that are
true iff they are true in all models; and in a homomorphism, it is the basic rela-
tions (not their negations) whose truth is preserved.
(Sato [1982] considers a negative closed world assumption, where ground
atoms are considered to be true if they cannot be proved false. However, he
shifts his ground from requiring "proved
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Publisher Resources

ISBN: 9781483221120