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Step * of Lemma geo-add-length_wf1

∀[e:BasicGeometry]. ∀[x,y:{p:Point| O_X_p} ].  (x + y ∈ {p:Point| O_X_p} )
BY
{ ProveWfLemma }

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Latex:

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


By

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Latex:
ProveWfLemma

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