The paper contains two remarks on finite sets of groupoid terms closed under subterms and the application of unifying pairs.
@article{118873, author = {Jaroslav Je\v zek}, title = {A note on finite sets of terms closed under subterms and unification}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {37}, year = {1996}, pages = {655-656}, zbl = {0882.08001}, mrnumber = {1426931}, language = {en}, url = {http://dml.mathdoc.fr/item/118873} }
Ježek, Jaroslav. A note on finite sets of terms closed under subterms and unification. Commentationes Mathematicae Universitatis Carolinae, Tome 37 (1996) pp. 655-656. http://gdmltest.u-ga.fr/item/118873/
Rewrite systems, Chapter 6, 243-320 in J. van Leeuwen, ed., Handbook of Theoretical Computer Science, B: Formal Methods and Semantics, North Holland, Amsterdam, 1990. | MR 1127191 | Zbl 0900.68283