@{\lambda ${ident i} : $ty. $p}
@{\lambda ${ident i} . $p}}}.
+notation > "\exists ident x:A.break term 19 Px" with precedence 20 for @{ 'exists (λ${ident x}:$A.$Px) }.
+
+notation > "\exists ident x.break term 19 Px" with precedence 20 for @{ 'exists (λ${ident x}.$Px) }.
+
notation "hvbox(\langle term 19 a, break term 19 b\rangle)"
with precedence 90 for @{ 'pair $a $b}.