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


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

1
1. EuclideanPlane
2. Point
3. O_X_x
4. Point
5. O_X_y
⊢ (extend Ox by Xy) (extend Oy by Xx) ∈ Point


Latex:


Latex:

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


By


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




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