arXiv subjects
Publications and source records attributed to Félix Bou.
In this paper from 2011 we consider $\textbf{IL}_0$, the closed fragment of the basic interpretability logic $\textbf{IL}$. We show that we can translate $\textbf{GL}_1$, the one variable fragment of Gödel-Löb's provabilty logic $\textbf{GL}$, into $\textbf{IL}_0$. Invoking a result on the PSPACE completeness of $\textbf{GL}_1$ we obtain the PSPACE hardness of $\textbf{IL}_0$.
In this paper we provide a simplified semantics for the logic KD45(G), i.e. the many-valued Gödel counterpart of the classical modal logic KD45. More precisely, we characterize KD45(G) as the set of valid formulae of the class of possibilistic Gödel Kripke Frames $\langle W,π\rangle$, where $W$ is a non-empty set of worlds and $π: W \longrightarrow [0, 1]$ is a normalized possibility distribution on $W$.
This short paper addresses the open problems left in a previous paper by Franco Montagna and Carles Noguera. Besides giving solutions to these two problems, some clarification concerning the role of the full vocabulary (including functional symbols) in the proofs there given is also discussed.