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The valuated ring of the arithmetical functions as a power series ring

Emil Daniel Schwab, Gheorghe Silberberg (2001)

Archivum Mathematicum

The paper examines the ring A of arithmetical functions, identifying it to the domain of formal power series over 𝐂 in a countable set of indeterminates. It is proven that A is a complete ultrametric space and all its continuous endomorphisms are described. It is also proven that A is a quasi-noetherian ring.

Un exemple effectif de gradué non noethérien associé à une valuation divisorielle

Vincent Cossart, Carlos Galindo, Olivier Piltant (2000)

Annales de l'institut Fourier

Soit R = k [ x , y , z ] ( x , y , z ) le localisé de l’anneau des polynômes à trois variables sur le corps k de caractéristique nulle. Nous construisons une valuation divisorielle ν de R , nous calculons un système minimal de générateurs de la k -algèbre gr ν ( R ) associée à la filtration ν -adique. Ce système est infini : gr ν ( R ) n’est pas noethérien.

When is each proper overring of R an S(Eidenberg)-domain?

Noômen Jarboui (2002)

Publicacions Matemàtiques

A domain R is called a maximal "non-S" subring of a field L if R ⊂ L, R is not an S-domain and each domain T such that R ⊂ T ⊆ L is an S-domain. We show that maximal "non-S" subrings R of a field L are the integrally closed pseudo-valuation domains satisfying dim(R) = 1, dimv(R) = 2 and L = qf(R).

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