Step
*
1
of Lemma
fpf-join-empty
.....equality.....
1. A : Type
2. B : A ─→ Type
3. d : A List
4. f1 : a:{a:A| (a ∈ d)} ─→ B[a]
5. eq : EqDecider(A)
⊢ filter(λa.tt;d) ~ d
BY
{ (Lemmaize []⋅ THEN ObviousListInduction⋅)⋅ }
Latex:
.....equality.....
1. A : Type
2. B : A {}\mrightarrow{} Type
3. d : A List
4. f1 : a:\{a:A| (a \mmember{} d)\} {}\mrightarrow{} B[a]
5. eq : EqDecider(A)
\mvdash{} filter(\mlambda{}a.tt;d) \msim{} d
By
(Lemmaize []\mcdot{} THEN ObviousListInduction\mcdot{})\mcdot{}
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