Mathematics – Algebraic Geometry
Scientific paper
2003-12-17
Mathematics
Algebraic Geometry
19pages, 2 figures, to appear in Journal of Algebra
Scientific paper
The Nash problem on arc families is affirmatively answered for a toric variety by Ishii and Kollar's paper which also shows the negative answer for general case. The Nash problem is one of questions about the relation between arc families and valuations. In this paper, the relation is described clearly for a toric variety. The arc space of a toric variety admits an action of the group scheme determined by the torus. Each orbit on the arc space corresponds to a lattice point in the cone and therefore corresponds to a toric valuation. The dominant relation among the orbits is described in terms of the lattice points. As a corollary we obtain the answer to the embedded version of the Nash problem for an invariant ideal on a toric variety.
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