Nuprl Lemma : mon_when_hom_swap 13,42

gh:GrpSig, f:MonHom(g,h), b:p:|g|. (when b. (f(p))) = f(when bp |h
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Definitions of StatementMonHom(M1,M2), when bp
Definitions, ff, tt, P  Q, t  T, if b then t else f fi , when bp, x:AB(x), P & Q, P  Q, P  Q, Unit, , MonHom(M1,M2),
Lemmasgrp sig wf, monoid hom wf, grp car wf, assert of bnot, eqff to assert, not wf, bnot wf, assert wf, iff transitivity, eqtt to assert, bool wf, monoid hom id, grp id wf

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