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Step * of Lemma pgeo-order_2-incidence

∀pg:ProjectivePlane. ∀l:Line.  (order(pg) = 2 ⇒ p,q:{p:Point| p I l} //p ≡ q ~ ℕ3)
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Latex:

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Latex:
\mforall{}pg:ProjectivePlane.  \mforall{}l:Line.    (order(pg)  =  2  {}\mRightarrow{}  p,q:\{p:Point|  p  I  l\}  //p  \mequiv{}  q  \msim{}  \mBbbN{}3)


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Latex:
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