Q == (P 
Q) & (P Q)
A,B:Prop. (A B) 
Prop
true
; a.as' falseT:Type, as:T List. null(as) 
Q == Q PA,B:Prop. (A B) Prop| Who Cites iff? | |
| iff | Def P Q == (P Q) & (P Q) |
| Thm* A,B:Prop. (A B) Prop | |
| null | Def null(as) == Case of as; nil true ; a.as' false |
| Thm* T:Type, as:T List. null(as) | |
| Thm* null(nil) | |
| rev_implies | Def P Q == Q P |
| Thm* A,B:Prop. (A B) Prop |
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