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- W1508994080 abstract "Some cases of varieties not admitting any extension were known to the ancients: for example, the Segre embedding of P1×P2 in P5 has no extensions other than cones because all varieties of degree 3 are classified ([Scorza1– 2, XXX], compare [Swinnerton-Dyer]); and systematic obstructions of a topological nature to the existence of X were discovered from around 1976 by Sommese and others (see [Sommese1], [Fujita1], [Badescu], [L’vovskii1– 2]). More recent work of Sommese points to the conclusion that very few projective varieties C can be hyperplane sections; for example, Sommese ∗Codice Fiscale: RDE MSN 48A30 Z114K" @default.
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- W1508994080 date "1990-01-01" @default.
- W1508994080 modified "2023-10-06" @default.
- W1508994080 title "Infinitesimal view of extending a hyperplane section - deformation theory and computer algebra" @default.
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