Page 202 - DCAP506_ARTIFICIAL_INTELLIGENCE

Artificial Intelligence

Notes In Prolog program is a description of data
parent(pam, bob). % Pam is a parent of Bob
parent(tom, bob).
parent(tom, liz).

parent(bob, ann).
parent(bob, pat).
parent(pat, jim)
Figure 14.1: Program in Prolog

Basic Notions

There are following notions present in prolog:
 Predicates: parent

– describes a relation
– defined by facts, rules, collectively called clauses
 Constant (symbol)s: tom, bob, x, y
 Variables: X, Y, Tom

 Atoms (simple goals): parent (A, a)
 Queries....

Did u know? In Prolog literature, constants are called atoms.

Self Assessment

Fill in the blanks:

1. Prolog is a logical and a declarative ...................... language.
2. Prolog is based upon ...................... principle (1965) together with mechanisms for extracting
answers proposed by Green (1968).

196 LOVELY PROFESSIONAL UNIVERSITY