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Step * of Lemma l_sum-wf-partial-nat

∀[L:partial(ℕ) List]. (l_sum(L) ∈ partial(ℕ))
BY
{ (InductionOnList THEN Unfold `l_sum` 0 THEN Reduce 0 THEN Try (Fold `l_sum` 0) THEN Auto) }

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Latex:

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Latex:
\mforall{}[L:partial(\mBbbN{})  List].  (l\_sum(L)  \mmember{}  partial(\mBbbN{}))


By

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Latex:
(InductionOnList  THEN  Unfold  `l\_sum`  0  THEN  Reduce  0  THEN  Try  (Fold  `l\_sum`  0)  THEN  Auto)

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