Monoids for Which Condition (P) Acts are Projective

Projectivity of acts and morita equivalence of monoids

Ulrich Knauer · Semigroup Forum · 1971 · 103 citations

Natural Sciences, Philosophy, Algebra +8

Perfect monoids

John Isbell · Semigroup Forum · 1971 · 49 citations

On equalizer-flat and pullback-flat acts

Peeter Normak · Semigroup Forum · 1987 · 37 citations

Natural Sciences, Orthodontics, Representation Theory +5

Flat and strongly flat s-systems

Sydney Bulman Fleming · Communications in Algebra · 1992 · 34 citations

Natural Sciences, Mathematics, Physics +4

On Perfect Semigroups

Torben Maack Bisgaard · Acta Mathematica Academiae Scientiarum Hungaricae · 1998 · 32 citations