Nuprl Lemma : rng_properties 13,42

r:Rng. IsRing(|r|;+r;0;-r;*;1) & IsEqFun(|r|;=
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Uprings 1
Definitions of StatementIsRing(T;plus;zero;neg;times;one), Rng
Definitionst  T, x:AB(x), IsRing(T;plus;zero;neg;times;one), IsMonoid(T;op;id), IsGroup(T;op;id;inv), True, T, , P & Q, Rng, P  Q, SqStable(P)
Lemmasrng wf, sq stable eqfun p, sq stable bilinear, sq stable inverse, sq stable ident, sq stable assoc, rng eq wf, eqfun p wf, bilinear wf, rng one wf, rng times wf, rng minus wf, inverse wf, rng zero wf, ident wf, rng plus wf, rng car wf, assoc wf, sq stable and

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