Hollow S-acts are characterized as indecomposable co-uniform acts, and hollow, locally cyclic, and indecomposable act classes are shown to be strictly nested, with supplements introduced to analyze unions of hollow acts.
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Co-uniform and hollow S-acts over monoids
Hollow S-acts are characterized as indecomposable co-uniform acts, and hollow, locally cyclic, and indecomposable act classes are shown to be strictly nested, with supplements introduced to analyze unions of hollow acts.