The Complexity of Dualisability: Three-Element Unary Algebras
David M. Clark, Brian Davey, Jane G. Pitkethly · International Journal of Algebra and Computation · 2003
We solve the dualisability problem in the class of three-element unary algebras. Our aim in tackling this class is to demonstrate the difficulty of the general dualisability problem. We also want to investigate the extent to which the dualisability of a finite algebra is a finiteness condition on the quasi-variety it generates.