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Step * 1 2 of Lemma sublist-iff-sub-co-list


1. [T] : Type
2. ∀L1:T List. (L1 ⊆ [] ⇐⇒ sub-co-list(T;L1;()))
⊢ ∀L1:T List. (L1 ⊆ [] ⇐⇒ sub-co-list(T;L1;[]))
BY
{ (Unfold `co-nil` -1 THEN Fold `nil` (-1) THEN Trivial) }

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Latex:

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Latex:

1.  [T]  :  Type
2.  \mforall{}L1:T  List.  (L1  \msubseteq{}  []  \mLeftarrow{}{}\mRightarrow{}  sub-co-list(T;L1;()))
\mvdash{}  \mforall{}L1:T  List.  (L1  \msubseteq{}  []  \mLeftarrow{}{}\mRightarrow{}  sub-co-list(T;L1;[]))


By

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Latex:
(Unfold  `co-nil`  -1  THEN  Fold  `nil`  (-1)  THEN  Trivial)

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