On the Mori cone of blow-ups of the plane

Abstract

We discuss some properties of the extremal rays of the cone of effective curves of surfaces that are obtained by blowing up the projective plane at points in very general position. The main motivation is to rectify an incorrect interpretation, in terms of the geometry of this cone, of the Segre--Harbourne--Gimigliano--Hirschowitz conjecture. Even though the arguments are based on elementary computations, the point of view leads to observe some other properties of the Mori cone, among which the fact that in the case of ten or more points the cone is not countably generated.

arXiv comment14 pages; v2: minor changes

References in corpus (1)

• Negative curves on very general blow-ups of P^2

Cited by in corpus (6)

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• Vanishing theorems for linearly obstructed divisors
• Algebraic surfaces and hyperbolic geometry
• Seshadri constants via Okounkov functions and the Segre-Harbourne-Gimigliano-Hirschowitz Conjecture
• On the influence of the Segre Problem on the Mori cone of blown-up surfaces
• On plane rational curves and the splitting of the tangent bundle