The gluing of maximal ideals—spectrum of a Noetherian ring—going up and going down in polynomial rings

Author:

de Souza Doering Ada Maria,Lequain Yves

Abstract

If M 1 , . . . , M s {M_1},\,...\,,\,{M_s} are maximal ideals of a ring R that have isomorphic residue fields, then they can be “glued” in the sense that a subring D of R with R is integral over D and M 1 D = . . . = M s D {M_1}\, \cap \,D\, = \,...\, = \,{M_s}\, \cap \,D can be constructed. We use this gluing process to prove the following result: Given any finite ordered set B \mathcal {B} , there exists a reduced Noetherian ring B and an embedding ψ : B S p e c B \psi :\,\mathcal {B}\, \to \,Spec\,B such that ψ \psi establishes a bijection between the maximal (respectively minimal) elements of B \mathcal {B} and the maximal (respectively minimal) prime ideals of B and such that given any elements β \beta ’ , β \beta of B \mathcal {B} , there exists a saturated chain of prime ideals of length r between ψ ( β ) \psi (\beta ’) and ψ ( β ) \psi (\beta ) if and only if there exists a saturated chain of length r between β \beta ’ and β \beta . We also use the gluing process to construct a Noetherian domain A with quotient field L and a Noetherian domain B between A and L such that: A B A\,\hookrightarrow \,B possesses the Going Up and the Going Down properties, A [ X ] B [ X ] A[X]\,\hookrightarrow \,B[X] is unibranched and A [ X ] B [ X ] A[X]\,\hookrightarrow \,B[X] possesses neither the Going Up nor the Going Down properties.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference13 articles.

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2. Chains of prime ideals in Noetherian domains;de Souza Doering, Ada Maria;J. Pure Appl. Algebra,1980

3. The converse to a well known theorem on Noetherian rings;Eakin, Paul M., Jr.;Math. Ann.,1968

4. Examples of noncatenary rings;Heitmann, Raymond C.;Trans. Amer. Math. Soc.,1979

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