well fnd Sections StandardLIB Doc
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Def WellFnd{i}(A;x,y.R(x;y))
Def == P:(AProp). (j:A. (k:A. R(k;j)  P(k))  P(j))  {n:A. P(n)}

is mentioned by

Thm* r1:(T1T1Prop), r2:(T2T2Prop).
Thm* T1 = T2
Thm* 
Thm* (x,y:T1. r1(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_iff]
Thm* r1:(T1T1Prop), r2:(T2T2Prop).
Thm* T1 = T2
Thm* 
Thm* (x,y:T1. r1(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]
Thm* r:(AAProp), B:Type, f:(BA).
Thm* WellFnd{i}(A;x,y.r(x,y))  WellFnd{i}(B;x,y.r(f(x),f(y)))		[inv_image_ind]
Thm* r:(TTProp), S:Type, f:(ST).
Thm* WellFnd{i}(T;x,y.r(x,y))  WellFnd{i}(S;x,y.r(f(x),f(y)))		[inv_image_ind_tp]
Thm* r:(TTProp), S:Type, f:(ST).
Thm* WellFnd{i}(T;x,y.r(x,y))  WellFnd{i}(S;x,y.r(f(x),f(y)))		[inv_image_ind_a]

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well fnd Sections StandardLIB Doc