Comments on "A class of symmetrical condensed node TLM methods derived directly from Maxwell\´s equations" [with reply]

In the original paper, LoVetri and Simons [see ibid, vol.41, p. 1419-28,1993] derive the three-dimensional symmetrical condensed node TLM algorithm using a characteristic based field decomposition of Maxwell´s equations. The goal and eventual result of the investigation was to present a mathematically sound method for deriving the TLM scattering and transfer events directly from Maxwell´s equations (without recourse to the approximation of space by a mesh of transmission lines). The statement made by Krumpholz and Russer, that the original derivation is erroneous, is not valid and the two specific points they raise are considered.<>