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Step * 1 1 of Lemma wfd-tree-cases


1. A : Type
2. w : wfd-tree(A)
3. ↑co-w-null(w)
⊢ w = w-nil() ∈ wfd-tree(A)
BY
{ (Subst' w ~ w-nil() 0⋅ THEN Auto) }

1
.....equality..... 
1. A : Type
2. w : wfd-tree(A)
3. ↑co-w-null(w)
⊢ w ~ w-nil()

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Latex:

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Latex:

1.  A  :  Type
2.  w  :  wfd-tree(A)
3.  \muparrow{}co-w-null(w)
\mvdash{}  w  =  w-nil()


By

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Latex:
(Subst'  w  \msim{}  w-nil()  0\mcdot{}  THEN  Auto)

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