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A characterization of Boolean rings

Source: Romania National Olympiad 2015, grade xii, p.1

August 23, 2019
superior algebraRing Theoryidempotency

Problem Statement

Let be a ring that has the property that all its elements are the product of two idempotent elements of it. Show that: a) 1 1 is the only unit of this ring. b) this ring is Boolean.