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Filtrations associated with singularities

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arxiv 2405.10898 v1 pith:M237SIBT submitted 2024-05-17 math.AG math.CV

classification math.AGmath.CV
keywords filtrationmathcalassociatedembeddedmulti-indexpairresolutionanalytic
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abstract

We fix a complex analytic normal singularity germ $(X,o)$ of dimension $\geq 2$ and a (not necessarily irreducible) reduced Weil divisor $(S,o)\subset (X,o)$. The embedded resolution of the pair determines a multi-index filtration of the local ring $\mathcal{O}_{X,o}$, which measures the embedded geometry of the pair. Furthermore, from the (induced) resolution of $(S,o)$ we also consider a multi-index filtration associated with $(S,o)$. This latter one can be lifted to a filtration of $\mathcal{O}_{X,o}$ too. The main result proves that the second filtration of $\mathcal{O}_{X,o}$ can be realized as a `limit' filtration of the first one (if we blow up certain centers sufficiently many times).

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  1. Dicritical divisors and hypercurvettes

    math.AG 2025-05 accept novelty 7.0 of 10

    For any modification of a smooth variety by blow-ups at a point, there is a rational function whose prescribed exceptional components are exactly the dicritical ones with prescribed degrees.

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