A survey of s-unital and locally unital rings

Abstract

We gather some classical results and examples that show strict inclusion between the families of unital rings, rings with enough idempotents, rings with sets of local units, locally unital rings, s-unital rings and idempotent rings.

Keywords

• Unital ring
• rings with enough idempotents
• rings with sets of local units
• locally unital ring
• s-unital ring
• idempotent ring