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Difference between revisions of "Bezout ring"

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An [[Integral domain|integral domain]] with a unit element in which any ideal of finite type is principal. Any principal ideal ring and also any valuation ring is Bezout. A Bezout ring is integrally closed, and its localizations (i.e. its rings of fractions with respect to multiplicative systems <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/b/b015/b015990/b0159901.png" />, cf. [[Localization in a commutative algebra|Localization in a commutative algebra]]) are again Bezout rings. For a finite set <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/b/b015/b015990/b0159902.png" /> of elements of a Bezout ring <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/b/b015/b015990/b0159903.png" /> there exist the greatest common divisor (the greatest common divisor of <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/b/b015/b015990/b0159904.png" /> has the form <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/b/b015/b015990/b0159905.png" />, <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/b/b015/b015990/b0159906.png" />, a so-called Bezout identity) and the lowest common multiple. A Noetherian ring (and even a ring that satisfies the ascending chain condition only for principal ideals) which is Bezout is a principal ideal ring. As for principal ideal rings, a module of finite type over a Bezout ring is a direct sum of a torsion module and a free module.
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An [[Integral domain|integral domain]] with a unit element in which any ideal of finite type is principal. Any principal ideal ring and also any valuation ring is Bezout. A Bezout ring is integrally closed, and its localizations (i.e. its rings of fractions with respect to multiplicative systems $S$, cf. [[Localization in a commutative algebra|Localization in a commutative algebra]]) are again Bezout rings. For a finite set $a_1,\ldots,a_n$ of elements of a Bezout ring $A$ there exist the greatest common divisor (the greatest common divisor of $(a_1,\ldots,a_n)$ has the form $\sum b_i a_i$, $b_i \in A$, a so-called Bezout identity) and the lowest common multiple. A Noetherian ring (and even a ring that satisfies the ascending chain condition only for principal ideals) which is Bezout is a principal ideal ring. As for principal ideal rings, a module of finite type over a Bezout ring is a direct sum of a torsion module and a free module.
  
  

Revision as of 06:42, 13 October 2014

An integral domain with a unit element in which any ideal of finite type is principal. Any principal ideal ring and also any valuation ring is Bezout. A Bezout ring is integrally closed, and its localizations (i.e. its rings of fractions with respect to multiplicative systems $S$, cf. Localization in a commutative algebra) are again Bezout rings. For a finite set $a_1,\ldots,a_n$ of elements of a Bezout ring $A$ there exist the greatest common divisor (the greatest common divisor of $(a_1,\ldots,a_n)$ has the form $\sum b_i a_i$, $b_i \in A$, a so-called Bezout identity) and the lowest common multiple. A Noetherian ring (and even a ring that satisfies the ascending chain condition only for principal ideals) which is Bezout is a principal ideal ring. As for principal ideal rings, a module of finite type over a Bezout ring is a direct sum of a torsion module and a free module.


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References

[a1] R. Gilmer, "Multiplicative ideal theory" , M. Dekker (1972)
How to Cite This Entry:
Bezout ring. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Bezout_ring&oldid=33606
This article was adapted from an original article by V.I. Danilov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article