| Who Cites absval? |
|
absval |
Def |i| == if 0 i i else -i fi |
| |
Thm* x: . |x|  |
|
iff |
Def P  Q == (P  Q) & (P  Q) |
| | Thm* A,B:Prop. (A  B) Prop |
|
pm_equal |
Def i = j == i = j i = -j |
| | Thm* a,b: . a = b Prop |
|
le_int |
Def i j ==  j < i |
| | Thm* i,j: . i j  |
|
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  |