Bemærk: Kan ikke leveres før jul.
Since any in-depth study of the lattice of varieties requires an understanding of free completely regular semigroups, the book begins by describing the free object on countably infinite sets and the properties of the lattice of fully invariant congruences on the free object.
Bemærk: Kan ikke leveres før jul.
The mapping that takes each variety to its intersection with the variety of bands is a complete retraction of the lattice of... Læs mere