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Grassmann defective surfaces

Claudio Fontanari (2004)

Bollettino dell'Unione Matematica Italiana

A projective variety V is 1 , h -defective if the Grassmannian of lines contained in the span of h + 1 independent points on V has dimension less than the expected one. In the present paper, which is inspired by classical work of Alessandro Terracini, we prove a criterion of 1 , h -defectivity for algebraic surfaces and we discuss its applications to Veronese embeddings and to rational normal scrolls.

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