Step * of Lemma eu-midpoint-trivial

e:EuclideanPlane. ∀a,b:Point.  (a=b=a  (a b ∈ Point))
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1
1. EuclideanPlane@i'
2. Point@i
3. Point@i
4. a=b=a@i
⊢ b ∈ Point


Latex:


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


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Latex:
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