Who Cites gt?
gt	Def i > j == j < i
	Thm* i,j:. i > j Prop
int_seg	Def {i..j} == {k:| i k < j }
	Thm* m,n:. {m..n} Type
int_upper	Def {i...} == {j:| ij }
	Thm* n:. {n...} Type
wellfounded	Def WellFnd{i}(A;x,y.R(x;y)) == P:(AProp). (j:A. (k:A. R(k;j) P(k)) P(j)) {n:A. P(n)}
	Thm* A:Type{i}, r:(AAProp{i}). WellFnd{i}(A;x,y.r(x,y)) Prop{i'}
lelt	Def i j < k == ij & j < k
le	Def AB == B < A
	Thm* i,j:. ij Prop
not	Def A == A False
	Thm* A:Prop. (A) Prop

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