AIP Conference Proceedings 2116, 140001 (2019); https://doi.org/10.1063/1.5114128 2116, 140001 © 2019 Author(s). 11-th Symposium on “Recent Trends in the Numerical Solution of Differential Equations”: Preface Cite as: AIP Conference Proceedings 2116, 140001 (2019); https://doi.org/10.1063/1.5114128 Published Online: 24 July 2019 Luigi Brugnano, and Ewa Weinmüller