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At: sym functionality wrt iff

  T:Type, R,R':(TTProp).
  (x,y:TR(x,y R'(x,y))  ((Sym x,y:TR(x,y))  (Sym x,y:TR'(x,y)))


By: (Unfold `sym` 0) THEN RepD THEN (RWW "-1" 0) THEN RelRST


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functionuniversepropimpliesall
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