num thy 1 Sections StandardLIB Doc
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Def EquivRel x,y:TE(x;y)
Def == Refl(T;x,y.E(x;y)) & (Sym x,y:TE(x;y)) & (Trans x,y:TE(x;y))

is mentioned by

Thm* EquivRel x,y:x ~ y[assoced_equiv_rel]

In prior sections: rel 1

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num thy 1 Sections StandardLIB Doc