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Step * of Lemma eu-colinear-switch

∀e:EuclideanPlane. ∀a,b,c:Point.  (Colinear(a;b;c) ⇒ (¬(a = c ∈ Point)) ⇒ Colinear(a;c;b))
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Latex:

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Latex:
\mforall{}e:EuclideanPlane.  \mforall{}a,b,c:Point.    (Colinear(a;b;c)  {}\mRightarrow{}  (\mneg{}(a  =  c))  {}\mRightarrow{}  Colinear(a;c;b))


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