SINCE the introduction of symbolic methods1,2 into the field of digital control, much has been written on the application of Boolean algebra to the analysis and synthesis of 2-terminal electromagnetic (relay and magnetic core) and electronic switching networks. In general, a switching network involves not only the network configuration and the switching elements but also the states of transmission through the network. A survey of the literature will show however, that it is generally (tacitly) assumed that the states of transmission through a switching network are limited to two values. For relays the two states are usually the establishment and the opening of a d-c path through the network; for electronic gate circuits these two states are usually the presence and absence of a pulse. An essentially similar situation prevails on the states of the switching elements in a network. For relays, a relay contact is either open or closed; for electronic gates, an input or output lead either carries a pulse or does not carry one.