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In ring theory, a branch of abstract algebra, an idempotent element or simply idempotent of a ring is an element a such that a = a. That is, the element is idempotent under the ring's multiplication. Inductively then, one can also conclude that a = a = a = a =... = a for any positive integer n. For example, an idempotent element of a matrix ring is precisely an idempotent matrix.
For general rings, elements idempotent under multiplication are involved in decompositions of modules, and connected to homological properties of the ring. In Boolean algebra, the main objects of study are rings in which all elements are idempotent under both addition and multiplication.
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