Step of Proof: equiv_rel_iff 12,41

Inference at * 
Iof proof for Lemma equiv rel iff:


  EquivRel(;A,B.A  B
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 by Unfold `equiv_rel` 0 
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 1

 1:   Refl(;A,B.A  B) & Sym(;A,B.A  B) & Trans(;A,B.A  B)
 .


DefinitionsEquivRel(T;x,y.E(x;y))

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