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Def EquivRel x,y:T. E(x;y)
Def == Refl(T;x,y.E(x;y)) & (Sym x,y:T. E(x;y)) & (Trans x,y:T. E(x;y))

is mentioned by

Thm* E:(TTProp), x,y:T. EquivRel(T)(_1 E _2)  (x (E^*) y)  (x E y)[rel_star_of_equiv]

In prior sections: rel 1

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