Nuprl Lemma : grp_inv_wf 13,42

g:GrpSig. ~  |g||g
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Upgrp sig object directory
Definitions of StatementGrpSig, |g|, ~
Definitionst.2, t.1, ~, |g|, t  T, x:AB(x), GrpSig
Lemmasgrp sig wf

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