well fnd Sections StandardLIB Doc
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Def {T} == T

is mentioned by

Thm* r1:(T1T1Prop), r2:(T2T2Prop).
Thm* T1 = T2
Thm* 
Thm* (x,y:T1r1(x,y r2(x,y))
Thm* 
Thm* WellFnd{i}(T1;x,y.r1(x,y))  WellFnd{i}(T2;x,y.r2(x,y))
[wellfounded_functionality_wrt_implies]
Def WellFnd{i}(A;x,y.R(x;y))
Def == P:(AProp). (j:A. (k:AR(k;j P(k))  P(j))  {n:AP(n)}
[wellfounded]

In prior sections: core

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well fnd Sections StandardLIB Doc