T
x,y:T. x = y 
(eq(x,y))T:Type. EqDecider(T) 
Typeb == if b
True else False fib:. b Prop Q == (P 
Q) & (P Q)A,B:Prop. (A B) Prop l) == 
i:
. i<||l|| & x = l[i] TT:Type, x:T, l:T List. (x l) Prop| Some definitions of interest. | |
| deq | Tx,y:T. x = y (eq(x,y)) |
| T:Type. EqDecider(T) Type | |
| assert | b == if b True else False fi |
| b:. b Prop | |
| iff | Q == (P Q) & (P Q) |
| A,B:Prop. (A B) 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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