The study of RC networks is important to understand digital MOS integrated circuits. Several authors studied these networks from the point of view of bounds on voltage waveform [1], [2], signal delay [3], etc. Wyatt [4] developed a qualitative theory of RC meshes having monotone elements. He showed that for a monotone exitation

, the sensitivity of the output node voltage of a nonleaky line is monotonic due to any conductance on the line.