Extension of holomorphic functions defined on non reduced analytic subvarieties

By J. Demailly. 2015

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The goal of this contribution is to investigate L² extension properties for holomorphic sections of vector bundles satisfying weak semi-positivity properties. Using techniques borrowed from recent proofs of the Ohsawa-Takegoshi extension theorem, we obtain several new surjectivity results for the restriction morphism to a non necessarily reduced subvariety, provided the latter is defined as the zero variety of a multiplier ideal sheaf. These extension results come with precise L² estimates and (probably) optimal curvature conditions.

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