double airy_Ai(double x); double airy_Bi(double x); double airy_Ai_deriv(double x); double airy_Bi_deriv(double x); double airy_zero_Ai(unsigned int s); double airy_zero_Bi(unsigned int s); double airy_zero_Ai_deriv(unsigned int s); double airy_zero_Bi_deriv(unsigned int s);