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Some numerical invariants of local rings
Authors:Josep À  lvarez Montaner
Affiliation:Departament de Matemàtica Aplicada I, Universitat Politècnica de Catalunya, Avinguda Diagonal 647, Barcelona 08028, Spain
Abstract:Let $R$ be a formal power series ring over a field of characteristic zero and $Isubseteq R$ any ideal. The aim of this work is to introduce some numerical invariants of the local rings $R/I$ by using the theory of algebraic $mathcal{D}$-modules. More precisely, we will prove that the multiplicities of the characteristic cycle of the local cohomology modules $H_I^{n-i}(R)$ and $H_{mathfrak{p}}^p(H_I^{n-i}(R))$, where $mathfrak{p} subseteq R$ is any prime ideal that contains $I$, are invariants of $R/I$.

Keywords:Local cohomology   $mathcal{D}$-modules
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