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Step * of Lemma geo-congruence-identity2

∀[e:BasicGeometry]. ∀[a,b,c,d:Point].  (a ≡ b) supposing (ab ≅ cd and c ≡ d)
BY
{ (Auto THEN HypSubst' (-2) (-1) THEN Auto THEN FLemma `geo-congruence-identity-sym` [-1] THEN Auto) }

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Latex:

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Latex:
\mforall{}[e:BasicGeometry].  \mforall{}[a,b,c,d:Point].    (a  \mequiv{}  b)  supposing  (ab  \00D0  cd  and  c  \mequiv{}  d)


By

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Latex:
(Auto  THEN  HypSubst'  (-2)  (-1)  THEN  Auto  THEN  FLemma  `geo-congruence-identity-sym`  [-1]  THEN  Auto)

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