Updates and counterfactuals
By: Gösta Grahne.
Contributors: University of Toronto. Dept. of Computer Science.
Series: KRR-TR-91-3; Technical reports on knowledge representation and reasoning -- 91-3
Publisher: Computer Science Department, University of Toronto
Published: 1991
Place of publication: Toronto, Ont
Language: eng
Number of pages: 46
Subjects: Database management
Notes: "June 1991."

Includes bibliographical references.