Internal approach to external sets and universes Vladimir KanoveiMichael Reeken OriginalPaper Pages: 229 - 257
Undefinability of propositional quantifiers in the modal system S4 Silvio GhilardiMarek Zawadowski OriginalPaper Pages: 259 - 271
On Ockham algebras: Congruence lattices and subdirectly irreducible algebras P. GarciaF. Esteva OriginalPaper Pages: 319 - 346