is mentioned by

Thm* i:, j:{i...}. WellFnd{u}({i..j};x,y.x > y)	[int_seg_well_founded_down]
Thm* i:, j:{i+1...}, E:({i..j}Prop). E(i) (k:{(i+1)..j}. E(k-1) E(k)) (k:{i..j}. E(k))	[int_seg_ind]
Thm* i:, j:{i...}. WellFnd{u}({i..j};x,y.x < y)	[int_seg_well_founded_up]
Thm* i:, E:({i...}Prop). E(i) (k:{i+1...}. E(k-1) E(k)) (k:{i...}. E(k))	[int_upper_ind]
Thm* n:. WellFnd{i}({n...};x,y.x < y)	[int_upper_well_founded]

In prior sections: int 1

Try larger context: StandardLIB