Problems on geometric structures of projective embeddings

Details Problems on geometric structures of projective embeddings Problems on geometric structures of projective embeddings

2000-01-03

arxiv.org/abs/math/0001004v1

Mathematics

Algebraic Geometry

25 pages, AmS-LaTeX with P.Burchard's diagram package(pb-diagram.sty)

Scientific paper

This is a survey of our research on geometric structures of projective embeddings and includes some topics of our talks in several symposia during 1990-99. We clarify our main problem, which is to construct a kind of geometric composition series of projective embeddings. The concept of "geometric composition series" is an analogy in Algebraic Geometry with Jordan-H\"{o}lder series in Group Theory. We present two of the candidates for the construction problem. To approach this problem, we show several results and new tools for handling higher obstructions appearing in infinitesimal liftings. As a byproduct of the tools, we obtain a simplified proof for a criterion on arithmetic normality described in terms of Differential Geometry. (Keywords): Petri's analysis, Second fundamental form, Syzygy, Arithmetic normality, Infinitesimal lifting, Geometric shell, Geometric composition series, Lefschetz chain, Dual Lefschetz chain, Meta-Lefschetz operator.

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