idempotent elements的用法和樣例：
例句
- If it is finite and nonempty, then it must contain at least one idempotent.
如果它是有限和非空的，則它必須包含至少一個(gè)冪等元。 - This paper is a study on the invertibility of the commutator of scalar-idempotent elements and scalar-involutory elements of a unitary ring.
摘要本文研究在一個(gè)有單位元的環(huán)中兩個(gè)倍冪等元的換位子與兩個(gè)倍對合元的換位子的可逆性問(wèn)題。
