j == if i=j
true ; false fi
i,j:
. (i=j) 
B(x) == x:{x:A| P(x) }B(x)
} == {k:| i 
k < j }m,n:. {m..n} Typex:A. g(f(x)) = x) & (y:B. f(g(y)) = y)f:(AB), g:(BA). InvFuns(A;B;f;g) Prop
A == A 
FalseA:Prop. (A) Prop| Some definitions of interest. | |
| eq_int | j == if i=j true ; false fi |
| i,j:. (i=j) | |
| fun_over_st | B(x) == x:{x:A| P(x) }B(x) |
| 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 | |
| not | A == A False |
| A:Prop. (A) Prop |
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