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Step * 1 of Lemma per-and_wf

.....wf..... 
1. A : Type
2. B : Type supposing A
⊢ λx.B ∈ per-function(A;a.Type)
BY
{ (TACTIC:Fold `per-type-family` 0 THEN Auto) }

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Latex:

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Latex:
.....wf..... 
1.  A  :  Type
2.  B  :  Type  supposing  A
\mvdash{}  \mlambda{}x.B  \mmember{}  per-function(A;a.Type)


By

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Latex:
(TACTIC:Fold  `per-type-family`  0  THEN  Auto)

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