Nuprl Lemma : nil_fseg 11,40

T:Type, l:(T List). fseg(T;[];l
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ProofTree


Definitionstype List, [], t  T, s = t, x:AB(x), x:AB(x), as @ bs, , Type, x:A  B(x), x:AB(x), fseg(T;L1;L2), Void, x:A.B(x), Top, S  T, s ~ t
Lemmasappend nil sq, member wf, top wf, append wf

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