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Studies in Rings generalised Unique Factorisation Rings

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Chapter-5<br />

REMARKS<br />

In this conclud<strong>in</strong>g chapter, we shall review some<br />

of the results given <strong>in</strong> the previous chapters and discuss<br />

the scope of further work.<br />

In chapter 2, we have proved that every GUFR<br />

has<br />

an Art<strong>in</strong>ian quotient r<strong>in</strong>g, by prov<strong>in</strong>g that every nonm<strong>in</strong>imal<br />

prime ideal conta<strong>in</strong>s a<br />

regular element, which<br />

gives rise to a normal ideal. Thus the def<strong>in</strong>ition of a<br />

GUFR can be reformed as·a Noetherian r<strong>in</strong>g <strong>in</strong>,which every<br />

non-m<strong>in</strong>imal prime ideal conta<strong>in</strong>s a<br />

4<br />

normal regular element.<br />

The theorem 2.30 that R is a commutative GUFR if<br />

a nd only if t;,<br />

has an Art<strong>in</strong>ian quotient r<strong>in</strong>g, leads to<br />

the relevant question; is every commutative Noetherian<br />

r<strong>in</strong>g a GUFR?<br />

Or does every commutative N6ethcrian r<strong>in</strong>g<br />

ha~e an Art<strong>in</strong>ian quotient r<strong>in</strong>g? In partjcular cases of<br />

c omrnu t a t i ve Noetherian r<strong>in</strong>gs, I t vca n be proved t.hat they<br />

have Art<strong>in</strong>ian quotient r<strong>in</strong>gso<br />

For <strong>in</strong>stance, if R is a<br />

commutative Noetherian irreducible (i.e., for any ideal<br />

A of R, A < A10 A 2<br />

, whenever A < Al and A 2)<br />

r<strong>in</strong>g, then<br />

R has an Art<strong>in</strong>ian quotient r<strong>in</strong>g.<br />

In the general case,<br />

we can say only upto the extent that a<br />

commutative<br />

Noethcrian r<strong>in</strong>g R can be embedded <strong>in</strong> a commutativp

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