Q == (P 
Q) & (P Q)
A,B:Prop. (A B) 
Prop 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 | |
| rev_implies |
Def P Q == Q P |
| Thm* A,B:Prop. (A B) Prop |
| Syntax: | P Q | has structure: | iff(P; Q) |
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