Title page for ETD etd-06102012-040442

Type of Document Master's Thesis
Author Chitale, Chandan S.
URN etd-06102012-040442
Title Extending Prolog with type inheritance and arithmetic
Degree Master of Science
Department Computer Science and Applications
Advisory Committee
Advisor Name Title
Roach, John W. Committee Chair
Bixler, J. Patrick Committee Member
Watson, Layne T. Committee Member
  • Prolog (Computer program language)
Date of Defense 1989-05-15
Availability restricted
Prolog is a logic programming language based on first order logic. It uses resolution

as a rule of inference, and unification is the heart of resolution. The unification algorithm

is a syntactic process and hence attaches no meaning to function and predicate

symbols. We incorporate arithmetic into unification by simultaneously solving linear

equations that are created during the unification of partially instantiated numeric expressions.

Prolog operates on the Herbrand universe, which is a single unstructured

domain. In case of large structured domains, the number of resolution steps required

for inference is large. We have incorporated type inheritance into Prolog to exploit

large structured domains. Types are subuniverses corresponding to sets of objects.

The subset of relation between types induces a hierarchy on the universe. Using the

property of inheritance it is possible to obtain shorter proofs in inference. We used the constraint satisfaction model and the hierarchical constraint satisfaction concept

to incorporate these extensions to Prolog. Thus, we succeeded in obtaining a logic

programming language with arithmetic and type inheritance. This implementation

extends standard Prolog and can be directly added to the WAM concept.

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