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Step * of Lemma accum-class_wf

∀[Info,A,B:Type]. ∀[X:EClass(A)]. ∀[b:A ─→ B]. ∀[f:B ─→ A ─→ B].  (accum-class(b,a.f[b;a];a.b[a];X) ∈ EClass(B))
BY
{ (ProveWfLemma THEN BLemma `es-interface-predecessors-nonempty` THEN Auto) }

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Latex:

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Latex:
\mforall{}[Info,A,B:Type].  \mforall{}[X:EClass(A)].  \mforall{}[b:A  {}\mrightarrow{}  B].  \mforall{}[f:B  {}\mrightarrow{}  A  {}\mrightarrow{}  B].
    (accum-class(b,a.f[b;a];a.b[a];X)  \mmember{}  EClass(B))


By

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Latex:
(ProveWfLemma  THEN  BLemma  `es-interface-predecessors-nonempty`  THEN  Auto)

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