Conjecture on PG-shell Lefschetz chains for projective embeddings
Conjecture on PG-shell Lefschetz chains for projective embeddings
Let be a complex projective manifold of dimension , let be an arithmetically normal embedding, and let and be suitably chosen Lefschetz and dual Lefschetz chains of . A PG-shell Lefschetz-chain conjecture asserts that the chains can be chosen so that each and is a PG-shell of , reduced along , and irreducible; each restricted conormal sheaf
is a vector bundle on extendable to as a vector bundle, and likewise
is a vector bundle extendable to as a vector bundle. Moreover, for a fixed manifold of dimension , one can suitably choose the embedding and the two chains so that a refinement of either chain realizes the Working Hypothesis referred to in the source.
Sources & referencesView supporting material
Primary source
Takeshi Usa, “Problems on geometric structures of projective embeddings”, arXiv:math/0001004 (2000).
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