j == if i=j
true ; false fi
Thm* 
i,j:
. i=j 
} == {k:| i 
k < j }
Thm* m,n:. {m..n} Type
j < k == ij & j < k
B == 
B < A
Thm* i,j:. ij Prop
A == A 
False
Thm* A:Prop. (A) Prop
| eq_int |
Def i=j == if i=j true ; false fi
Thm* |
| int_seg |
Def {i..j} == {k:| i k < j }
Thm* |
| lelt |
Def i j < k == ij & j < k
|
| le |
Def AB == B < A
Thm* |
| not |
Def A == A False
Thm* |
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