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Step * of Lemma p9-tarski-aux

∀e:HeytingGeometry. ∀a,b,c:Point.  (a # bc ⇒ ab ≅ cb ⇒ (∃x:Point. a=x=c))
BY
{ (InstLemma `isosceles-mid-exists` [] THEN Trivial) }

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Latex:

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


By

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Latex:
(InstLemma  `isosceles-mid-exists`  []  THEN  Trivial)

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