Comments on "Hybrid Computer Solution of Optimal Control Problems by the Maximum Principle"

In their recent short note,1 Miura et al. present a unique hybrid computer solution to certain optimal control problems. However, the authors give the impression that they are unaware of current research in this area represented by a voluminous amount of literature and numerous conferences devoted to this topic. The authors enumerate the problems and shortcominings of "conventional" techniques, yet do not reference recent contributions. The intent of this correspondence is to cite a few inconsistencies in the note and to chronologically alter their definition of "conventional."