An amalgamated duplication of a ring along an ideal: the basic properties

Details An amalgamated duplication of a ring along an ideal: the basic properties An amalgamated duplication of a ring along an ideal: the basic properties

2006-05-23

arxiv.org/abs/math/0605602v2

Mathematics

Commutative Algebra

Replace a previous version. Journal of Algebra and Applications (to appear)

Scientific paper

We introduce a new general construction, denoted by $R\JoinE$, called the amalgamated duplication of a ring $R$ along an $R$--module $E$, that we assume to be an ideal in some overring of $R$. (Note that, when $E^2 =0$, $R\JoinE$ coincides with the Nagata's idealization $R\ltimes E$.) After discussing the main properties of the amalgamated duplication $R\JoinE$ in relation with pullback--type constructions, we restrict our investigation to the study of $R\JoinE$ when $E$ is an ideal of $R$. Special attention is devoted to the ideal-theoretic properties of $R\JoinE$ and to the topological structure of its prime spectrum.

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