Computability theory for digital computation is well developed. Computability theory is less well developed for [[analog computation]] that occurs in [[analog computer]]s, [[analog signal processing]], [[analog electronics]], [[neural networks]] and continuous-time [[control theory]], modelled by [[differential equation]]s and continuous [[dynamical system]]s (Orponen 1997; Moore 1996). | Computability theory for digital computation is well developed. Computability theory is less well developed for [[analog computation]] that occurs in [[analog computer]]s, [[analog signal processing]], [[analog electronics]], [[neural networks]] and continuous-time [[control theory]], modelled by [[differential equation]]s and continuous [[dynamical system]]s (Orponen 1997; Moore 1996). |