Hypersequent Calculi for Intermediate Predicate Logics

Abstract

We report on the current status of our on-going project to develop well-behaved hypersequent calculi for intermediate predicate logics, such as the linearity axiom $\mathbf{LIN}\colon\left(\varphi\to\psi\right)\lor\left(\psi\to\varphi\right)$ and the constant domain axiom $\mathbf{CD}\colon\forall x\left(\varphi\lor\psi\left(x\right)\right)\to\varphi\lor\forall x\psi\left(x\right)$.