Abstract :
The 0- and 1-cell elements of topology are identified with a single terminal-pair and a two-terminal-pair transmission network, rather than with a single-terminal (or node) and a one-terminal-pair (or branch), respectively, in order to facilitate topological consideration of unilateral transmission networks, as typified by the triode valve. It is shown that even the simplest triode network has a feedback interpretation; in more general networks, several signal transmission loops may be distinguished, including both inverting and noninverting unilateral paths.
