Step * of Lemma eu-add-length-comm

[e:EuclideanPlane]. ∀[x,y:{p:Point| O_X_p} ].  (x x ∈ {p:Point| O_X_p} )
BY
(Auto THEN EqTypeCD THEN Auto) }

1
1. EuclideanPlane
2. {p:Point| O_X_p} 
3. {p:Point| O_X_p} 
⊢ x ∈ Point

2
.....set predicate..... 
1. EuclideanPlane
2. {p:Point| O_X_p} 
3. {p:Point| O_X_p} 
⊢ O_X_x y


Latex:


Latex:
\mforall{}[e:EuclideanPlane].  \mforall{}[x,y:\{p:Point|  O\_X\_p\}  ].    (x  +  y  =  y  +  x)


By


Latex:
(Auto  THEN  EqTypeCD  THEN  Auto)




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