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单词 WelldefinednessOfProductOfFinitelyGeneratedIdeals
释义

well-definedness of product of finitely generated ideals


Ler R be of a commutative ring with nonzero unity.  If

𝔞=(a1,,am)=(α1,,αμ)(1)

and

𝔟=(b1,,bn)=(β1,,βν)(2)

are two finitely generatedMathworldPlanetmathPlanetmathPlanetmath ideals of R, both with two , then the ideals

𝔠:=(a1b1,,aibj,,ambn)

and

𝔡:=(α1β1,,αiβj,,αμβν)

are equal.

Proof.  By (1) and (2), for every i,j, there are elements rik,sjl of R such that

ai=ri1α1++riμαμ,bj=sj1β1++sjνβν.(3)

Multiplying the equations (3) we see that

aibj=(ri1sj1)(α1β1)+(ri2sj1)(α2β1)++(riμsjν)(αμβν),

whence the generatorsPlanetmathPlanetmathPlanetmath aibj of 𝔠 belong to 𝔡 and consecuently 𝔠𝔡.  The reverse containment is seen similarly.

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更新时间:2025/5/4 5:08:14