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单词 PrimalElement
释义

primal element


An element r in a commutative ring R is called primal if whenever rab, with a,bR, then thereexist elements s,tR such that

  1. 1.

    r=st,

  2. 2.

    sa and tb.

Lemma. In a commutative ring, an element that is both irreduciblePlanetmathPlanetmath and primal is a prime elementMathworldPlanetmath.

Proof.

Suppose a is irreducible and primal, and abc. Since a is primal, there is x,yR such that a=xy, with xb and yc. Since a is irreducible, either x or y is a unit. If x is a unit, with z as its inverseMathworldPlanetmathPlanetmathPlanetmathPlanetmath, then za=zxy=y, so that ay. But yc, we have that ac.∎

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