a University of Amsterdam, Programming Research Group, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
b University of Twente, Formal Methods and Tools, P.O. Box 217, 7500 AE Enschede, The Netherlands
Abstract:
We present a complete axiomatisation for four-valued sequential logic. It consists of nine axioms, from which all valid laws can be derived by equational reasoning. These nine axioms are independent of each other.