Completeness of extended unification based on basic narrowing -- Proving definite clauses without explicit use of inductions -- Pseudo extension in default reasoning and belief revision by model inference -- An approach to nonmonotonic inference mechanism in production system KORE/IE -- Nonmonotonic parallel inheritance network -- Logic programming debugger using control flow specification -- ALEX: The logic programming language with explicit control and without cut-operators -- Lattice programming methodology -- A simple programming system written in GHC and its reflective operations -- Implementation of full GHC by communicating processes -- Inference methods and semantics on or-type knowledge bases -- Access program to minimize redundant refutations on the network database system -- EUODHILOS: A general-purpose reasoning assistant system — Concept and implementation — -- Logic based lexical analyser LAX -- Extraction of characteristic facts and abstract generation -- Knowledge representation and reasoning for discourse understanding.

This volume contains a selection of papers presented at the Seventh Logic Programming Conference that took place in Tokyo, April 11-14, 1988. It is the successor to the previous conference proceedings published as Lecture Notes in Computer Science Volumes 221, 264 and 315. The book covers various aspects of logic programming such as foundations, programming languages/systems, concurrent programming, knowledge bases, applications of computer-aided reasoning and natural language processing. The papers on foundations present theoretical results on "narrowing", a proof strategy for proving properties of Prolog programs based on inductionless induction and several issues in nonmonotonic reasoning. Of special interest to mathematicians is the paper on computer-aided reasoning, which describes a system for assisting human reasoning. Natural language application papers treat the lexical analysis of Japanese sentences, a system that generates a summary of a given sentence and a new knowledge representation formalism suited for representing dynamic behavior by extending the frame system.