Q == (P 
Q) & (P Q)
A,B:Prop. (A B) 
PropxL.P(x)) == x:T. (x L) P(x)T:Type, L:T List, P:(T
Prop). (xL.P(x)) Prop l) == 
i:
. i<||l|| & x = l[i] TT:Type, x:T, l:T List. (x l) Prop| Some definitions of interest. | |
| iff | Q == (P Q) & (P Q) |
| A,B:Prop. (A B) Prop | |
| l_all | xL.P(x)) == x:T. (x L) P(x) |
| T:Type, L:T List, P:(TProp). (xL.P(x)) Prop | |
| l_member | l) == i:. i<||l|| & x = l[i] T |
| T:Type, x:T, l:T List. (x l) Prop |
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