Trifee objects in e-varieties of locally e-solid semigroups
THOMAS E. HALL, Y.T. Yeh · Massey Research Online (Massey University) · 2001
We construct a modification of Churchill and Trotter’s trifree objects in e-varieties of locally E-solid semigroups, which have the property, for e-varieties of locally inverse semigroups and for e-varieties of Esolid semigroups, of being isomorphic to the bifree objects.