Comments on "On optimal control of spatially distributed systems

"For original paper see N. Motee et al., ibid., vol.53, no.7, p.1616-29, (2008)". The authors of the above paper aim at developing a theory of spatial decaying operators for spatially varying systems that are continuous in time, but discrete in space. This falls clearly into the area of infinite-dimensional systems theory and the authors do quote results from this text.