Step * of Lemma geo-sum-eq-x

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e:BasicGeometry. ∀a,b,c,d:Point.  ((X |ab| |cd| ∈ Length)  (a ≡ b ∧ c ≡ d))
BY
(InstLemma `geo-length-null-segment` [] THEN RepeatFor (ParallelLast'⋅THEN RepeatFor ((D THENA Auto))) }

1
1. BasicGeometry
2. Point
3. |aa| X ∈ Length
4. Point
5. Point
6. Point
7. |ab| |cd| ∈ Length
⊢ a ≡ b

2
1. BasicGeometry
2. Point
3. |aa| X ∈ Length
4. Point
5. Point
6. Point
7. |ab| |cd| ∈ Length
⊢ c ≡ d


Latex:


Latex:
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\mforall{}e:BasicGeometry.  \mforall{}a,b,c,d:Point.    ((X  =  |ab|  +  |cd|)  {}\mRightarrow{}  (a  \mequiv{}  b  \mwedge{}  c  \mequiv{}  d))


By


Latex:
(InstLemma  `geo-length-null-segment`  []
  THEN  RepeatFor  2  (ParallelLast'\mcdot{})
  THEN  RepeatFor  5  ((D  0  THENA  Auto)))




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