Néron-Severi group (source code)

= Néron-Severi group
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{title2=$\operatorname{NS}(X)$}
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The Néron-Severi group is the quotient $\operatorname{Pic}(X)/\operatorname{Pic}^0(X)$ of the <Picard group> by line bundles algebraically equivalent to zero.