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On classification of finite commutative chain rings
AIMS Mathematics 2022, 7(2): 1742-1757
Published: 15 February 2022
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Let R be a finite commutative chain ring with invariants p , n , r , k , m . It is known that R is an extension over a Galois ring G R ( p n , r ) by an Eisenstein polynomial of some degree k. If p k , the enumeration of such rings is known. However, when p k, relatively little is known about the classification of these rings. The main purpose of this article is to investigate the classification of all finite commutative chain rings with given invariants p , n , r , k , m up to isomorphism when p k . Based on the notion of j-diagram initiated by Ayoub, the number of isomorphism classes of finite (complete) chain rings with ( p 1 ) k is determined. In addition, we study the case ( p 1 ) k , and show that the classification is strongly dependent on Eisenstein polynomials not only on p , n , r , k , m . In this case, we classify finite (incomplete) chain rings under some conditions concerning the Eisenstein polynomials. These results yield immediate corollaries for p-adic fields, coding theory and geometry.

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