i
i else -i fi
x:
. |x| 
Q == (P 
Q) & (P Q)A,B:Prop. (A B) Propj == 
j < ii,j:. ij 
Q == Q PA,B:Prop. (A B) Propj == 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| | |
| iff |
Def P Q == (P Q) & (P Q) |
| Thm* A,B:Prop. (A B) Prop | |
| le_int |
Def ij == j < i |
| Thm* i,j:. ij | |
| rev_implies |
Def P Q == Q P |
| Thm* A,B:Prop. (A B) Prop | |
| 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 |
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