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Step * of Lemma formal-sum-add_wf

∀[S:Type]. ∀[K:RngSig]. ∀[x,y:formal-sum(K;S)].  (x + y ∈ formal-sum(K;S))
BY
{ (Intros
   THEN Unhide
   THEN DVar `x'
   THEN DVar `y'
   THEN EqTypeCD
   THEN Auto
   THEN BLemma `formal-sum-add_functionality`
   THEN Auto) }

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Latex:

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Latex:
\mforall{}[S:Type].  \mforall{}[K:RngSig].  \mforall{}[x,y:formal-sum(K;S)].    (x  +  y  \mmember{}  formal-sum(K;S))


By

---

Latex:
(Intros
  THEN  Unhide
  THEN  DVar  `x'
  THEN  DVar  `y'
  THEN  EqTypeCD
  THEN  Auto
  THEN  BLemma  `formal-sum-add\_functionality`
  THEN  Auto)

---

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