Hi, I'm trying to solve the following (simplified) ODE system (see attached file).
Where X1 and X2 are my functions, z is the integration variable and f1,g1,f2,g2 are 4 different functions of X1 and X2.
My biggest problem is that the integrals depend on the integration variable itself.
I tried to consider z as a symbolic variable in this way:
but I got an error.