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Step * of Lemma geo-tar-opp-side-symmetry

∀e:BasicGeometry. ∀a,b,c,d:Point.  (geo-tar-opp-side(e;a;b;c;d) ⇒ geo-tar-opp-side(e;b;a;c;d))
BY
{ (Auto THEN (Unfold `geo-tar-opp-side` 0 THEN Unfold `geo-tar-opp-side` -1) THEN Auto) }

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Latex:

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Latex:
\mforall{}e:BasicGeometry.  \mforall{}a,b,c,d:Point.    (geo-tar-opp-side(e;a;b;c;d)  {}\mRightarrow{}  geo-tar-opp-side(e;b;a;c;d))


By

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Latex:
(Auto  THEN  (Unfold  `geo-tar-opp-side`  0  THEN  Unfold  `geo-tar-opp-side`  -1)  THEN  Auto)

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