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Step * of Lemma formal-sum-add_wf1

∀[S:Type]. ∀[K:RngSig]. ∀[x,y:basic-formal-sum(K;S)].  (x + y ∈ basic-formal-sum(K;S))
BY
{ (RepUR ``basic-formal-sum formal-sum-add`` 0 THEN Auto) }

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Latex:

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


By

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Latex:
(RepUR  ``basic-formal-sum  formal-sum-add``  0  THEN  Auto)

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