to a Prop is normally invisible since it is pretty obvious when it is needed.| NOTE: | This operator coercing a to a Prop is normally invisible since it is pretty obvious when it is needed. |
| Who Cites assert? | |
| assert | Def  b == if b True else False fi |
Thm*  b:. b  Prop | |
| 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 |
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