We use our minds for many different purposes, but the most significant of these is to extend our knowledge and understanding of the world. While there is no precise formula for accomplishing this, it ...

We introduce several restricted versions of the structural rules in the implicational fragment of Gentzen's sequent calculus LJ. For example, we permit the applications of a structural rule only if ...

The Journal of Philosophical Logic provides a forum for work at the crossroads of philosophy and logic, old and new, with contributions ranging from conceptual to technical. Accordingly, the Journal ...