Nuprl Lemma : ring_non_triv_wf 13,42

r:Rng. r  0   
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Uprings 1
Definitions of StatementRng, r  0
Definitionsr  0, t  T, x:AB(x), Rng
Lemmasrng wf, rng zero wf, rng one wf, rng car wf, nequal wf

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