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

.....set predicate..... 
1. e : EuclideanPlane
2. x : {p:Point| O_X_p} 
⊢ O_X_x + X
BY
{ ((GenConclTerm ⌜x + X⌝⋅ THENA Auto⋅) THEN D -2 THEN Unhide THEN Auto) }

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Latex:

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


By

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

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