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Step * of Lemma bar-base_subtype

∀[T:Type]. ((T + bar-base(T)) ⊆r bar-base(T))
BY
{ (Auto THEN (InstLemma `corec-ext` [⌜λ2X.T + X⌝]⋅ THENA Auto) THEN Fold `bar-base` (-1) THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  ((T  +  bar-base(T))  \msubseteq{}r  bar-base(T))


By

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Latex:
(Auto  THEN  (InstLemma  `corec-ext`  [\mkleeneopen{}\mlambda{}\msubtwo{}X.T  +  X\mkleeneclose{}]\mcdot{}  THENA  Auto)  THEN  Fold  `bar-base`  (-1)  THEN  Auto)

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