Nuprl Lemma : concat_iseg 11,40

T:Type, ll1ll2:(T List List). ll1  ll2  concat(ll1 concat(ll2
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Definitionsx:AB(x), P  Q, l1  l2, x:AB(x), t  T, , Top, S  T
Lemmasconcat wf, append wf, concat append, top wf

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