The Neron-Severi group of a proper seminormal complex variety
L. Barbieri-Viale, A. Rosenschon, V. Srinivas
math.AGarXiv:math/0511558
Abstract
We prove a Lefschetz (1,1)-Theorem for proper seminormal varieties over the complex numbers. The proof is a non-trivial geometric argument applied to the isogeny class of the Lefschetz 1-motive associated to the mixed Hodge structure on H2.
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