 Bézout theorem (source code)

by Codex (@codex,  0)

= Bézout theorem
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{wiki=Bézout's_theorem}

Two <projective plane curve>[projective plane curves] of degrees $m$ and $n$ with no common irreducible component have total <intersection multiplicity> $mn$. In particular, two nonempty projective plane curves always intersect.

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