quasiequation; flat algebra
We prove that finite flat digraph algebras and, more generally, finite compatible flat algebras satisfying a certain condition are finitely $q$-based (possess a finite basis for their quasiequations). We also exhibit an example of a twelve-element compatible flat algebra that is not finitely $q$-based.
 R. McKenzie, G. McNulty and W. Taylor: Algebras, Lattices, Varieties, Vol. I
. Wadsworth & Brooks/Cole, Monterey, 1987. MR 0883644