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Topological Structure of Diagonalizable Algebras and Corresponding Logical Properties of Theories

This paper studies the topological duality between diagonalizable algebras and bi-topological spaces. In particular, the correspondence between algebraic properties of a diagonalizable algebra and topological properties of its dual space is investigated. Since the main example of a diagonalizable algebra is the Lindenbaum algebra of an r.e. theory extending Peano Arithmetic, endowed with an operator deﬁned by means of the provability predicate of the theory, this duality gives the possibility to study arithmetical properties of theories from a topological point of view. We ﬁnd topological characterization of (cid:1) 1 -sound theories and of sentences that are (cid:1) 1 -conservative over such a theory.