Advances in Modal Logic Volume 13

<p>Logic deals with the fundamental notions of truth and falsity. Modal logic arose from the<br />philosophical study of “modes of truth” with the two most common modes being “necessarily  true” and “possibly true”. Nowadays modal logic  is used to reason about knowledge about obligations about programs and about time among others.<br />Actual research in modal logic  spans  philosophy computer science and mathematics using techniques from relational structures universal algebra topology and proof theory.<br /><br />These proceedings record the papers presented at the 2020 conference on Advances in Modal Logic a biennial conference series with an aim to report on important new developments in pure and applied modal logic.<br /><br />The topics include decidability and complexity results proof theory model theory interpolation related problems in algebraic logic as well as history of modal reasoning.</p>