Prop
T:Type{i'}. col{i:l}(T) 
Type{i'}
c2 == x:T. x c1 
x c2T:Type, c1,c2:Collection(T). c1 c2 PropT:Type. < > Collection(T) c == c(x)T:Type, x:T, c:Collection(T). x c Prop| Who Cites col? | |
| col |
Def Collection(T) == TProp |
| Thm* T:Type{i'}. col{i:l}(T) Type{i'} | |
| col_le |
Def c1 c2 == x:T. x c1 x c2 |
| Thm* T:Type, c1,c2:Collection(T). c1 c2 Prop | |
| col_none | Def < > (x) == False |
| Thm* T:Type. < > Collection(T) | |
| col_member |
Def x c == c(x) |
| Thm* T:Type, x:T, c:Collection(T). x c Prop |
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