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Krull symmetric Noetherian rings and their homogeneous components. (English) Zbl 0591.16013

A noetherian ring R is Krull symmetric if for every pair of ideals \(T\subseteq S\) of R the right and left Krull dimensions of S/T are equal. A module M is K-homogeneous if all non-zero submodules of M have the same Krull dimension. In general, the sum of two homogeneous left ideals of the same Krull dimension need not be homogeneous. However, if R is a Krull symmetric noetherian ring such that the associated primes of R are minimal primes, then the sum of homogeneous left ideals with the same Krull dimension is homogeneous. In this case, for any ordinal \(\alpha\), the ring contains a unique maximal homogeneous ideal \(H_{\alpha}\) of Krull dimension \(\alpha\). Only finitely many \(H_{\alpha}\) are non-zero and their direct sum is a faithful ideal of R. The ring R has an artinian classical quotient ring if and only if this non-zero ideal contains a non-zero-divisor. Finally, the previous result is used to obtain another proof of a theorem due to Warfield concerning decompositions of rings.
Reviewer: T.H.Lenagan

MSC:

16P60 Chain conditions on annihilators and summands: Goldie-type conditions
16P40 Noetherian rings and modules (associative rings and algebras)
16P50 Localization and associative Noetherian rings
16D70 Structure and classification for modules, bimodules and ideals (except as in 16Gxx), direct sum decomposition and cancellation in associative algebras)
16Dxx Modules, bimodules and ideals in associative algebras
Full Text: DOI

References:

[1] Beachy, J. A., Stable torsion radicals over FBN-rings, J. Pure Appl. Algebra, 24, 235-244 (1982) · Zbl 0489.16019
[2] Beachy, J. A., Rings with finite reduced rank, Comm. Algebra, 10, 1517-1536 (1982) · Zbl 0499.16004
[3] Beachy, J. A.; Blair, W. D., Finitely annihilated modules and orders in artinian rings, Comm. Algebra, 6, 1-34 (1978) · Zbl 0405.16005
[4] Boyle, A. K.; Feller, E. H., The endomorphism ring of a Δ-module over a right noetherian ring, Israel J. Math., 45 (1983) · Zbl 0521.16026
[5] Brown, K. A.; Lenagan, T. H.; Stafford, J. T., Weak ideal invariance and localisation, J. Lond. Math. Soc., 21, 53-61 (1980) · Zbl 0427.16009
[6] Golan, J. S., Localization of noncommutative rings, (Monographs and Textbooks, 30 (1975), Marcel Dekker: Marcel Dekker New York) · Zbl 0199.35502
[7] Goldie, A.; Krause, G., Artinian quotient rings of ideal invariant noetherian rings, J. Algebra, 63, 374-388 (1980) · Zbl 0428.16004
[8] Gordon, R.; Robson, J. C., Krull dimension, AMS Memoirs, 133 (1973) · Zbl 0269.16017
[9] Lenagan, T. H.; Moss, P. B., \(K\)-symmetric rings, J. Lond. Math. Soc., 21, 45-52 (1980) · Zbl 0438.16013
[10] Muller, B. J., The quotient problem for noetherian rings, Canad. J. Math., 33, 734-748 (1981) · Zbl 0478.16009
[11] Nastasescu, C., Modules Δ-injective sur les anneauxàdimension de Krull, Comm. Algebra, 9, 1395-1426 (1981) · Zbl 0468.16020
[12] Warfield, R. B., Quotient rings and localization for noetherian rings, J. Algebra, 72, 166-182 (1981) · Zbl 0472.16001
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