Electronic Circuit Domain Theory
Connected terminals have the same signal
(=> (Connected ?t1 ?t2) (Signal ?t1 (Signal ?t2)))
(=> (Connected ?t1 ?t2) (= (Signal ?t1) (Signal ?t2)))
Signal at terminal is either on or off
(or (Signal ?t On) (Signal ?t Off))
(not (= On Off))
Connected is commutative
(<=> (Connected ?t1 ?t2) (Connected ?t2 ?t1))