The conference is organized by the Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences in collaboration with the Union of the Bulgarian Mathematicians and the Faculty of Mathematics and Informatics of Sofia University. One of the main goals of the conference Mathematics Days in Sofia (MDS) is to bring together Bulgarian mathematicians and computer scientists working all over the world. In this way, the event will enrich the relations between the mathematicians working in Bulgaria and the Bulgarian mathematical diaspora. The first edition of MDS was held in 2014 at the initiative of a number of prominent Bulgarian mathematicians working in Bulgaria and abroad and attended by more than 300 participants from all over the world. The second conference was organized in 2017 thus making MDS a traditional meeting [...]