Definitions int 1 Sections StandardLIB Doc
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Some definitions of interest.
natDef  == {i:| 0i }
Thm*   Type
wellfoundedDef WellFnd{i}(A;x,y.R(x;y))
Def == P:(AProp). (j:A. (k:AR(k;j P(k))  P(j))  {n:AP(n)}
Thm* A:Type{i}, r:(AAProp{i}). WellFnd{i}(A;x,y.r(x,y))  Prop{i'}

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Definitions int 1 Sections StandardLIB Doc