About The Congruence Of Certain Semigroups

Petrich,M．described a congruence on an inverse semigroup S bymeans of its kernel and trace．Gomes described the R－unipotentcongruence on a regular semigroup S by means of its kernel andhyper－trace．In this psper we describe the gencral inverse semigroupand the rectangular group and(Clifford congruence by means oftheir kernels and hyper－traces．...