Conjecture on intersections of Nash sets and maximal divisorial sets

Let EE be a prime divisor, and let {pi}iI\{p_i\}_{i\in I} be the infinitely near points blown up to obtain the minimal model of EE. Let pi0p_{i_0} be any free point among them. Write Epi0E_{p_{i_0}} for the divisor associated with pi0p_{i_0}, and let Contq(Epi0)\overline{\operatorname{Cont}^q(E_{p_{i_0}})} denote the closure of the maximal divisorial set at order qq.

Intersection conjecture. For some qq, the intersection

Ei0ENE\bigcap_{E'\equiv_{i_0} E}\overline{N}_{E'}

coincides with

Contq(Epi0).\overline{\operatorname{Cont}^q(E_{p_{i_0}})}.

The conjecture concerns the relation between Nash sets and maximal divisorial sets. The paper leaves both the existence and the value of qq conjectural; in the special one-Puiseux-pair case, a related equality is known, but the stated equality is false in general for the analogous i0=1i_0=1 formulation.

Sources & referencesView supporting material

Primary source

Javier Fernandez de Bobadilla, Maria Pe Pereira and Patrick Popescu-Pampu, “On the generalized Nash problem for smooth germs and adjacencies of curve singularities”, arXiv:1501.06898 (2017).

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