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Step * of Lemma sq_stable__geo-triangle

∀e:EuclideanPlaneStructure. ∀a,b,c:Point.  SqStable(a # bc)
BY
{ (Unfold `geo-triangle` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}e:EuclideanPlaneStructure.  \mforall{}a,b,c:Point.    SqStable(a  \#  bc)


By

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Latex:
(Unfold  `geo-triangle`  0  THEN  Auto)

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