c == c(x)
T:Type, x:T, c:Collection(T). x c PropT:Type. < > Collection(T)
Q == (P 
Q) & (P Q)A,B:Prop. (A B) Prop Q == Q PA,B:Prop. (A B) Prop| Who Cites col member? | |
| col_member |
Def x c == c(x) |
| Thm* T:Type, x:T, c:Collection(T). x c Prop | |
| col_none | Def < > (x) == False |
| Thm* T:Type. < > Collection(T) | |
| 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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