Coleff-Herrera currents, duality, and Noetherian operators

Details Coleff-Herrera currents, duality, and Noetherian operators Coleff-Herrera currents, duality, and Noetherian operators

2009-02-18

arxiv.org/abs/0902.3064v2

Mathematics

Complex Variables

Scientific paper

Let $\I$ be a coherent subsheaf of a locally free sheaf $\Ok(E_0)$ and suppose that $\F=\Ok(E_0)/\I$ has pure codimension. Starting with a residue current $R$ obtained from a locally free resolution of $\F$ we construct a vector-valued Coleff-Herrera current $\mu$ with support on the variety associated to $\F$ such that $\phi$ is in $\I$ if and only if $\mu\phi=0$. Such a current $\mu$ can also be derived algebraically from a fundamental theorem of Roos about the bidualizing functor, and the relation between these two approaches is discussed. By a construction due to Bj\"ork one gets Noetherian operators for $\I$ from the current $\mu$. The current $R$ also provides an explicit realization of the Dickenstein-Sessa decomposition and other related canonical isomorphisms.

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