On the loci of morphisms from P1 to G(r,n) with fixed splitting type of the restricted universal sub-bundle or quotient bundle

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On the loci of morphisms from P1 to G(r,n) with fixed splitting type of the restricted universal sub-bundle or quotient bundle

Mandal, Sayanta

Journal of algebra, 11/2021, Volume: 585

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Let n≥4, 2≤r≤n−2 and e≥1. We show that the intersection of the locus of degree e morphisms from P1 to G(r,n) with the restricted universal sub-bundles having a given splitting type and the locus of degree e morphisms with the restricted universal quotient-bundle having a given splitting type is non-empty and generically transverse along at least one component of the intersection. As a consequence, we get that the locus of degree e morphisms from P1 to G(r,n) with the restricted tangent bundle having a given splitting type need not always be irreducible.

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