i
i else -i fi
x:
. |x| 
j == 
j < ii,j:. (ij) 
j == if i < j true ; false fii,j:. (i < j) b == if b false else true fib:. b | Who Cites absval? | |
| absval | Def |i| == if 0i i else -i fi |
| Thm* x:. |x| | |
| le_int | Def ij == j < i |
| Thm* i,j:. (ij) | |
| lt_int | Def i < j == if i < j true ; false fi |
| Thm* i,j:. (i < j) | |
| bnot | Def b == if b false else true fi |
| Thm* b:. b |
| Syntax: | |i| | has structure: | absval(i) |
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