Step * 1 1 1 of Lemma eu-cong-angle-symm


1. EuclideanPlane@i'
2. Point@i
3. Point@i
4. Point@i
5. ¬(a b ∈ Point)
6. ¬(c b ∈ Point)
⊢ ¬(a b ∈ Point)
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Latex:


Latex:

1.  e  :  EuclideanPlane@i'
2.  a  :  Point@i
3.  b  :  Point@i
4.  c  :  Point@i
5.  \mneg{}(a  =  b)
6.  \mneg{}(c  =  b)
\mvdash{}  \mneg{}(a  =  b)


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Latex:
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