interpretation "pair pi1" 'pi1b x y = (first _ _ x y).
interpretation "pair pi2" 'pi2b x y = (second _ _ x y).
-notation "hvbox(\langle a, break b\rangle)" left associative with precedence 70 for @{ 'pair $a $b}.
+notation "hvbox(\langle term 19 a, break term 19 b\rangle)"
+with precedence 90 for @{ 'pair $a $b}.
interpretation "pair" 'pair a b = (pair _ _ a b).
inductive exT (A:Type) (P:A→CProp) : CProp ≝