Logic Journal of IGPL Advance Access originally published online on September 26, 2007
Logic Journal of IGPL 2007 15(5-6):535-551; doi:10.1093/jigpal/jzm039
Monadic Distributive Lattices
Departamento de Matemática, Universidad Nacional del Sur, 8000 Bahía Blanca, Argentina & Instituto de Ciencias Básicas, Universidad Nacional de San Juan, 5400 San Juan, Argentina. E-mails: avfigallo{at}gmail.com, aziliani{at}criba.edu.ar, inespascual756{at}hotmail.com
The purpose of this paper is to investigate the variety of algebras, which we call monadic distributive lattices, as a natural generalization of monadic Heyting algebras [16]. It is worth mentioning that the latter is a proper subvariety of the first one, as it is shown in a simple example. Our main interest is the characterization of simple and subdirectly irreducible monadic distributive lattices. In order to do this, a duality theory for these algebras is developed. The duality enables us to describe the lattice of congruences on monadic distributive lattices. Finally, our attention is focused upon the relationship between the category of dual spaces associatted with these algebras and the category of perfect Ono frames considered by Bezhanishvili in order to represent monadic Heyting algebras.
Key Words: Bounded distributive lattices Priestley spaces congruence relations subdirectly irreducible algebras.
This work was partially supported by the Universidad Nacional del Sur, Bahía Blanca, Argentina.
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