Tight approximation for rationally simply connected varieties

Olivier Benoist; Olivier Wittenberg

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arXiv · 2503.10564

Tight approximation for rationally simply connected varieties

Olivier Benoist·Olivier Wittenberg

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Abstract

We prove that holomorphic maps from an open subset of a complex smooth projective curve to a complex smooth projective rationally simply connected variety can be approximated by algebraic maps for the compact-open topology. This theorem can be applied in particular when the target is a smooth hypersurface of degree d in P^n with n greater than or equal to d^2-1. We deduce it from a more general result: the tight approximation property holds for rationally simply connected varieties over function fields of complex curves.

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Olivier Benoist, Olivier Wittenberg. 2025-03-13. Tight approximation for rationally simply connected varieties. https://arxiv.org/abs/2503.10564

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