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Step * 1 of Lemma eu-add-length-zero


1. e : EuclideanPlane
2. x : {p:Point| O_X_p} 
⊢ x + X = x ∈ Point
BY
{ (DSetVars THEN Unfold `eu-add-length` 0) }

1
1. e : EuclideanPlane
2. x : Point
3. O_X_x
⊢ (extend Ox by XX) = x ∈ Point

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Latex:

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Latex:

1.  e  :  EuclideanPlane
2.  x  :  \{p:Point|  O\_X\_p\} 
\mvdash{}  x  +  X  =  x


By

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Latex:
(DSetVars  THEN  Unfold  `eu-add-length`  0)

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