Bj. Falkowski et S. Rahardja, Generalised hybrid arithmetic transform for systems of incompletely specified quaternary functions, ELECTR LETT, 37(16), 2001, pp. 1006-1007
A novel representation of systems of incompletely specified quaternary func
tions, called 'hybrid arithmetic transform'. is Shown. The new transform ut
ilises integrated standard and GF(4) algebra as the core of the generalised
expansions. The transform matrix of the expansion is defined by an arbitra
ry set of orthogonal one-variable functions in GF(4). The introduced expans
ion is generalised by applying to it the concept of polarity.