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Step * of Lemma geo-add-length_wf

∀[e:BasicGeometry]. ∀[x,y:Length].  (x + y ∈ Length)
BY
{ (Intros THEN Unhide THEN D 2 THEN D -1 THEN EqTypeCD THEN Auto THEN BLemma `geo-add-length_functionality` THEN Auto) }

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Latex:

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Latex:
\mforall{}[e:BasicGeometry].  \mforall{}[x,y:Length].    (x  +  y  \mmember{}  Length)


By

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Latex:
(Intros
  THEN  Unhide
  THEN  D  2
  THEN  D  -1
  THEN  EqTypeCD
  THEN  Auto
  THEN  BLemma  `geo-add-length\_functionality`
  THEN  Auto)

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