Step * of Lemma geo-cong-angle_inversion

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e:BasicGeometry. ∀a,b,c:Point.  ((a b ∧ b)  abc ≅a cba)
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1
1. BasicGeometry
2. Point
3. Point
4. Point
5. b
6. b
⊢ abc ≅a cba


Latex:


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\mforall{}e:BasicGeometry.  \mforall{}a,b,c:Point.    ((a  \#  b  \mwedge{}  c  \#  b)  {}\mRightarrow{}  abc  \mcong{}\msuba{}  cba)


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