Definitions | null(as), b, True, last(L), P Q, P Q, P Q, left + right, [], [car / cdr], A List, , , {i..j}, {x:A| B(x)} , i j < k, P & Q, i j , n+m, ||as||, x:A. B(x), #$n, False, P Q, x:AB(x), Void, , s = t, t T, a < b, A B, x:A B(x), (x l), A, type List, s ~ t, Type, l[i], i z j, i <z j, hd(l) |