Georg Zetzsche. Separability by piecewise testable languages and downward closures beyond subwords. In Anuj Dawar, Erich Grädel, editors, Proceedings of the 33rd Annual ACM/IEEE Symposium on Logic in Computer Science, LICS 2018, Oxford, UK, July 09-12, 2018. pages 929-938, ACM, 2018. [doi]
Abstract is missing.