P
A:Prop. Dec(A) 
Prop
Q == (P 
Q) & (P Q)A,B:Prop. (A B) PropA == A FalseA:Prop. (A) Prop Q == Q PA,B:Prop. (A B) Prop| Who Cites decidable? | |
| decidable | Def Dec(P) == P P |
| Thm* A:Prop. Dec(A) Prop | |
| iff | Def P Q == (P Q) & (P Q) |
| Thm* A,B:Prop. (A B) Prop | |
| not | Def A == A False |
| Thm* A:Prop. (A) Prop | |
| rev_implies | Def P Q == Q P |
| Thm* A,B:Prop. (A B) Prop |
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