Linear systems in $\mathbb{P}^2$ with base points of bounded multiplicity
@article{Yang2004LinearSI, title={Linear systems in \$\mathbb\{P\}^2\$ with base points of bounded multiplicity}, author={Stephanie Yang}, journal={Journal of Algebraic Geometry}, year={2004}, volume={16}, pages={19-38} }
We present a proof of the Harbourne-Hirschowitz conjecture for linear systems with base points of multiplicity seven or less. This proof uses a well-known degeneration of the projective plane, as well as a combinatorial technique that arises from specializing points onto a line.
14 Citations
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References
SHOWING 1-10 OF 14 REFERENCES
Linear systems of plane curves with base points of equal multiplicity
- Mathematics
- 1998
In this article we address the problem of computing the dimenlsion of the space of plane curves of degree d with n general points of multiplicity m. A conjecture of Harbourne and Hirschowitz implies…
THE DIMENSION OF QUASIHOMOGENEOUS PLANAR LINEAR SYSTEMS WITH MULTIPLICITY FOUR
- Mathematics
- 2001
A linear system of plane curves satisfying multiplicity conditions at points in general position is called special if the dimension is larger than the expected dimension. A (−1) curve is an…
Degenerations of Planar Linear Systems
- Mathematics, Computer Science
- 1997
An approach is proposed based on an analysis of the corresponding linear system on a degeneration of the plane itself, leading to a simple recursion for these dimensions, obtaining results in the ``quasi-homogeneous'' case when all the multiplicities are equal except one.
THE GEOMETRY OF RATIONAL SURFACES AND HILBERT FUNCTIONS OF POINTS IN THE PLANE
- Mathematics
- 1986
We study the structure of the set of numerically effective divisor classes on a rational surface and apply this to study hilbert functions of the homogeneous coordinate rings of 0-cycles on curves of…
Existence De Faisceaux Réflexifs De Rang Deux SurP3 À Bonne Cohomologie
- Mathematics
- 1987
© Publications mathématiques de l’I.H.É.S., 1987, tous droits réservés. L’accès aux archives de la revue « Publications mathématiques de l’I.H.É.S. » (http://…
Une conjecture pour la cohomologie des diviseurs sur les surfaces rationelles génériques.
- Mathematics
- 1989
0. Introduction. Soient pl5..., pr des points suffisamment generaux (ou generiques) du plan projectif et ml9 ..., mr des entiers positifs. Quelle est la dimension du Systeme lineaire des courbes…