-extern const unsigned function_index_zeta2;
-inline function zeta(const ex & p1, const ex & p2) {
- return function(function_index_zeta2, p1, p2);
+class zeta2_SERIAL { public: static unsigned serial; };
+template<typename T1, typename T2>
+inline function zeta(const T1 & p1, const T2 & p2) {
+ return function(zeta2_SERIAL::serial, ex(p1), ex(p2));
+}
+class zeta_SERIAL;
+template<> inline bool is_the_function<class zeta_SERIAL>(const ex & x)
+{
+ return is_the_function<zeta1_SERIAL>(x) || is_the_function<zeta2_SERIAL>(x);