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blowing down
In mathematics, blowing down is a type of geometric modification in algebraic geometry.〔.〕 It is the inverse operation of blowing up.〔.〕
On an algebraic surface, blowing down a curve lying on the surface is a typical effect of a birational transformation. The curves that blow down, to a non-singular point, are of a special kind: they are rational curves, with self-intersection number −1.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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