Newton–Okounkov bodies of exceptional curve valuations

• Autores: Carlos Galindo Pastor, Julio José Moyano Fernández, Francisco Monserrat, Matthias Nickel
• Localización: Revista matemática iberoamericana, ISSN 0213-2230, Vol. 36, Nº 7, 2020, págs. 2147-2182
• Idioma: inglés
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• Resumen

  • We prove that the Newton–Okounkov body associated to the flag E∙:={X=Xr⊃Er⊃{q}}, defined by the surface X and the exceptional divisor Er given by any divisorial valuation of the complex projective plane P2, with respect to the pull-back of the line-bundle OP2(1) is either a triangle or a quadrilateral, characterizing when it is a triangle or a quadrilateral. We also describe the vertices of that figure. Finally, we introduce a large family of flags for which we determine explicitly their Newton–Okounkov bodies which turn out to be triangular.