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equiv rel functionality wrt iff111111 1. T : Type
2. T' : Type
3. E : TTProp
4. E' : T'T'Prop
5. T = T' 6. x,y:T. E(x,y) E'(x,y)
7. (a:Prop. aa) & (Sym A,B:Prop. AB) & (Trans A,B:Prop. AB)
(a:T'. E'(a,a))
& (a,b:T'. E'(a,b) E'(b,a))
& (a,b,c:T'. E'(a,b) E'(b,c) E'(a,c))