Some Doxastic \L ukasiewicz Logic

Abstract

We propose a doxastic \L ukasiewicz logic \textbf{B\L} that is sound and complete with respect to the class of Kripke-based models in which atomic propositions and accessibility relations are both infinitely valued in the standard MV-algebra [0,1]. We also introduce some extensions of \textbf{B\L} corresponding to axioms \textbf{D}, \textbf{4}, and \textbf{T} of classical epistemic logic. Furthermore, completeness of these extensions are established corresponding to the appropriate classes of models.