Handbook of logic in artificial intelligence and logic programming
Term rewriting and all that
A Machine-Oriented Logic Based on the Resolution Principle
Journal of the ACM (JACM)
Unification of concept terms in description logics
Journal of Symbolic Computation
Unification in a Description Logic with Transitive Closure of Roles
LPAR '01 Proceedings of the Artificial Intelligence on Logic for Programming
The description logic handbook: theory, implementation, and applications
The description logic handbook: theory, implementation, and applications
Admissible Rules of Modal Logics
Journal of Logic and Computation
Temporal Logic and State Systems (Texts in Theoretical Computer Science. An EATCS Series)
Temporal Logic and State Systems (Texts in Theoretical Computer Science. An EATCS Series)
Journal of Logic and Computation
Nominal Unification from a Higher-Order Perspective
RTA '08 Proceedings of the 19th international conference on Rewriting Techniques and Applications
Admissible Rules of Łukasiewicz Logic
Journal of Logic and Computation
Journal of Logic and Computation
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This paper offers a brief analysis of the unification problem in modal transitive logics related to the logic S4: S4 itself, K4, Grz and Gödel-Löb provability logic GL. As a result, new, but not the first, algorithms for the construction of `best' unifiers in these logics are being proposed. The proposed algorithms are based on our earlier approach to solve in an algorithmic way the admissibility problem of inference rules for S4 and Grz. The first algorithms for the construction of `best' unifiers in the above mentioned logics have been given by S. Ghilardi in [16]. Both the algorithms in [16] and ours are not much computationally efficient. They have, however, an obvious significant theoretical value a portion of which seems to be the fact that they stem from two different methodological approaches.