evalf_func(psi1_evalf).
derivative_func(psi1_deriv).
series_func(psi1_series).
+ latex_name("\\psi").
overloaded(2));
//////////
evalf_func(psi2_evalf).
derivative_func(psi2_deriv).
series_func(psi2_series).
- latex_name("\\psi").
+ latex_name("\\psi").
overloaded(2));