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arxiv: 1503.03385 · v1 · pith:6XSZOSBFnew · submitted 2015-03-11 · 🧮 math.AG

Quadro-quadric special birational transformations from projective spaces to smooth complete intersections

classification 🧮 math.AG
keywords birationalmathbbquadro-quadricsmoothspecialbasecompletelocus
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Let \phi: \mathbb{P}^{r}\dashrightarrow Z be a birational transformation with a smooth connected base locus scheme, where Z\subseteq\mathbb{P}^{r+c} is a nondegenerate prime Fano manifold. We call \phi a quadro-quadric special briational transformation if \phi and \phi^{-1} are defined by linear subsystems of |\mathcal{O}_{\mathbb{P}^{r}}(2)| and |\mathcal{O}_{Z}(2)| respectively. In this paper we classify quadro-quadric special birational transformations in the cases where either (i) Z is a complete intersection and the base locus scheme of \phi^{-1} is smooth, or (ii) Z is a hypersurface.

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