The free completely regular semigroup on a set

On semi-groups in which <i>x^r</i> = <i>x</i>

J. A. Green, D. Rees · Mathematical Proceedings of the Cambridge Philosophical Society · 1952 · 94 citations

Natural Sciences, Mathematics, Combinatorics +6

The category of semilattices

Alfred Horn, Naoki Kimura · Algebra Universalis · 1971 · 90 citations

Natural Sciences, Computer Science, Mathematics +4

Free inverse semigroups

H. E. Scheiblich · Semigroup Forum · 1972 · 56 citations

A Homomorphism Theorem for Semigroups

D. B. McAlister · Journal of the London Mathematical Society · 1968 · 41 citations

Natural Sciences, Property Law, Representation Theory +7

Free inverse semigroups are not finitely presentable

Boris M. Schein · Acta Mathematica Academiae Scientiarum Hungaricae · 1975 · 33 citations

Natural Sciences, Mathematics, Dynamical Systems +2