Step * of Lemma isosceles-mid-exists

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e:HeytingGeometry. ∀a,b,c:Point.  (a bc  ab ≅ cb  (∃x:Point. a=x=c))
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1
1. HeytingGeometry
2. Point
3. Point
4. Point
5. bc
6. ab ≅ cb
⊢ ∃x:Point. a=x=c


Latex:


Latex:
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\mforall{}e:HeytingGeometry.  \mforall{}a,b,c:Point.    (a  \#  bc  {}\mRightarrow{}  ab  \mcong{}  cb  {}\mRightarrow{}  (\mexists{}x:Point.  a=x=c))


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