Step * 2 of Lemma eu-add-length-comm

.....set predicate..... 
1. EuclideanPlane
2. {p:Point| O_X_p} 
3. {p:Point| O_X_p} 
⊢ O_X_x y
BY
((GenConclTerm ⌜y⌝⋅ THENA Auto⋅THEN -2 THEN Unhide THEN Auto) }


Latex:


Latex:
.....set  predicate..... 
1.  e  :  EuclideanPlane
2.  x  :  \{p:Point|  O\_X\_p\} 
3.  y  :  \{p:Point|  O\_X\_p\} 
\mvdash{}  O\_X\_x  +  y


By


Latex:
((GenConclTerm  \mkleeneopen{}x  +  y\mkleeneclose{}\mcdot{}  THENA  Auto\mcdot{})  THEN  D  -2  THEN  Unhide  THEN  Auto)




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