 Movable part of a linear system (source code)

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= Movable part of a linear system
{title2=$M=D-F$}

= Movable part
{synonym}

= Movable divisor
{synonym}

The movable part is $|D-F|$, where $F$ is the <fixed part>. It has no <fixed components>. On a <smooth algebraic surface> its associated divisor is <nef>: for each curve choose a member avoiding that curve and use nonnegative local <intersection multiplicities>.

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