Definitions quot 1 Sections StandardLIB Doc
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Some definitions of interest.
equiv_relDef 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))
Thm* T:Type, E:(TTProp). (EquivRel x,y:TE(x,y))  Prop
subtypeDef S  T == x:Sx  T

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Definitions quot 1 Sections StandardLIB Doc