Nuprl Lemma : rel_star_symmetric 4,23

T:Type, R:(TTProp). (Sym x,y:Tx R y (Sym x,y:Tx (R^*) y
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DefinitionsSym x,y:TE(x;y), R^*, x:AB(x), P  Q, x f y, Prop, t  T, R^-1, R1 => R2, P  Q, P & Q, P  Q
Lemmasrel inverse star, rel inverse wf, rel star monotonic, rel star wf

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