We study the bi-graded Hilbert function of ideals of general fat points with same multiplicity in P1 × P1. Our first tool is the multiprojective-affine-projective method introduced by the second author in previous works with A. V. Geramita and A. Gimigliano where they solved the case of double points. In this way, we compute the Hilbert function when the smallest entry of the bi-degree is at most the multiplicity of the points. Our second tool is the differential Horace method introduced by J. Alexander and A. Hirschowitz to study the Hilbert function of sets of fat points in standard projective spaces. In this way, we compute the entire bi-graded Hilbert function in the case of triple points.

On the Hilbert function of general fat points in P1 × P1 / Carlini, E.; Catalisano, M. V.; Oneto, A.. - In: MICHIGAN MATHEMATICAL JOURNAL. - ISSN 0026-2285. - 69:3(2020), pp. 601-632. [10.1307/MMJ/1596700821]

On the Hilbert function of general fat points in P1 × P1

Oneto A.
2020

Abstract

We study the bi-graded Hilbert function of ideals of general fat points with same multiplicity in P1 × P1. Our first tool is the multiprojective-affine-projective method introduced by the second author in previous works with A. V. Geramita and A. Gimigliano where they solved the case of double points. In this way, we compute the Hilbert function when the smallest entry of the bi-degree is at most the multiplicity of the points. Our second tool is the differential Horace method introduced by J. Alexander and A. Hirschowitz to study the Hilbert function of sets of fat points in standard projective spaces. In this way, we compute the entire bi-graded Hilbert function in the case of triple points.
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Carlini, E.; Catalisano, M. V.; Oneto, A.
On the Hilbert function of general fat points in P1 × P1 / Carlini, E.; Catalisano, M. V.; Oneto, A.. - In: MICHIGAN MATHEMATICAL JOURNAL. - ISSN 0026-2285. - 69:3(2020), pp. 601-632. [10.1307/MMJ/1596700821]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/282897
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