Step * 1 1 of Lemma geo-ab-eq-x

.....assertion..... 
1. BasicGeometry
2. Point
3. Point
4. a ≡ b
⊢ |aa| |ab| ∈ Length
BY
(BLemma `geo-congruent-iff-length` THEN Auto) }


Latex:


Latex:
.....assertion..... 
1.  e  :  BasicGeometry
2.  a  :  Point
3.  b  :  Point
4.  a  \mequiv{}  b
\mvdash{}  |aa|  =  |ab|


By


Latex:
(BLemma  `geo-congruent-iff-length`  THEN  Auto)




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