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arxiv: 1009.1199 · v1 · pith:OBY6JQIUnew · submitted 2010-09-07 · 🧮 math.AG

Secant varieties of P² x P^n embedded by O(1,2)

classification 🧮 math.AG
keywords secantembeddedidealvarietiesarbitraryconstructiondecompositiondefining
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We describe the defining ideal of the rth secant variety of P^2 x P^n embedded by O(1,2), for arbitrary n and r at most 5. We also present the Schur module decomposition of the space of generators of each such ideal. Our main results are based on a more general construction for producing explicit matrix equations that vanish on secant varieties of products of projective spaces. This extends previous work of Strassen and Ottaviani.

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