Contributions to the theory of semi-groups, IV
Kiyoshi Iséki · Proceedings of the Japan Academy Series A Mathematical Sciences · 1956
Following G. Thierrin [7], a semi-group S is called strongly re- versible, if, for any wo elements a, b of S, there are three positive integers r, s and t such that (ab)--ab --b*a.Such a notion is a generalisWdon of a commutative semi-group.