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Step * of Lemma geo-length-flip

∀e:BasicGeometry. ∀[a,b:Point].  (|ab| = |ba| ∈ Length)
BY
{ (Auto THEN EqTypeCD THEN Auto) }

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Latex:

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Latex:
\mforall{}e:BasicGeometry.  \mforall{}[a,b:Point].    (|ab|  =  |ba|)


By

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Latex:
(Auto  THEN  EqTypeCD  THEN  Auto)

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