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Laplace Equations and the Weak Lefschetz Property

Published online by Cambridge University Press:  20 November 2018

Emilia Mezzettiaaa ,
Rosa M. Miré-Roig  and
Giorgio Ottaviani
Emilia Mezzettiaaa
Affiliation:
Dipartimento di Matematica e Geoscienze, Università di Trieste, Via Valerio 12/1, 34127 Trieste, Italy, e-mail: [email protected]
Rosa M. Miré-Roig
Affiliation:
Facultat de Matemàtiques, Department d'Algebra i Geometria, Gran Via des les Corts Catalanes 585, 08007 Barcelona, Spain, e-mail: [email protected]
Giorgio Ottaviani
Affiliation:
Dipartimento di Matematica, Università di Firenze, Viale Morgagni 67/A I-50134 Firenze, Italy, e-mail: [email protected]
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Abstract

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We prove that $r$ independent homogeneous polynomials of the same degree $d$ become dependent when restricted to any hyperplane if and only if their inverse system parameterizes a variety whose $(d-1)$- osculating spaces have dimension smaller than expected. This gives an equivalence between an algebraic notion (called the Weak Lefschetz Property) and a differential geometric notion, concerning varieties that satisfy certain Laplace equations. In the toric case, some relevant examples are classified, and as a byproduct we provide counterexamples to Ilardi's conjecture.

Keywords

13E1014M2514N0514N1553A20osculating spaceweak Lefschetz propertyLaplace equationstoric threefold
Type
Research Article
Information
Canadian Journal of Mathematics , Volume 65 , Issue 3 , 01 June 2013 , pp. 634 - 654
Copyright
Copyright © Canadian Mathematical Society 2013

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