} == {k:
| i 
k < j }
m,n:. {m..n} 
Typex:A. g(f(x)) = x) & (y:B. f(g(y)) = y)f:(A
B), g:(BA). InvFuns(A;B;f;g) Prop
j == if i<j
true ; false fii,j:. (i<j) 
== {i:| 0i } Type| Some definitions of interest. | |
| int_seg | } == {k:| i k < j } |
| m,n:. {m..n} Type | |
| inv_funs_2 | x:A. g(f(x)) = x) & (y:B. f(g(y)) = y) |
| f:(AB), g:(BA). InvFuns(A;B;f;g) Prop | |
| lt_int | j == if i<j true ; false fi |
| i,j:. (i<j) | |
| nat | == {i:| 0i } |
| Type |
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