Step * 1 of Lemma eu-length-flip


1. EuclideanPlane@i'
2. Point
3. Point
⊢ |ab| |ba| ∈ Point
BY
EAuto }


Latex:


Latex:

1.  e  :  EuclideanPlane@i'
2.  a  :  Point
3.  b  :  Point
\mvdash{}  |ab|  =  |ba|


By


Latex:
EAuto  2




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