Step * 1 1 of Lemma sq_stable__geo-le

.....wf..... 
1. BasicGeometry
2. {p:Point| O_X_p}  ⊆Length
3. Length
4. Length
⊢ ∃p',q':{p:Point| O_X_p} ((p' p ∈ Length) ∧ (q' q ∈ Length) ∧ X_p'_q') ∈ ℙ
BY
(RepeatFor (MemCD) THEN Auto) }


Latex:


Latex:
.....wf..... 
1.  e  :  BasicGeometry
2.  \{p:Point|  O\_X\_p\}    \msubseteq{}r  Length
3.  p  :  Length
4.  q  :  Length
\mvdash{}  \mexists{}p',q':\{p:Point|  O\_X\_p\}  .  ((p'  =  p)  \mwedge{}  (q'  =  q)  \mwedge{}  X\_p'\_q')  \mmember{}  \mBbbP{}


By


Latex:
(RepeatFor  4  (MemCD)  THEN  Auto)




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