Following the success of the proceedings of the conference GEMS'09 published as a special issue of Ars Mathematica Contemporanea [Vol. 4 (2011), No. 2] we plan to compile proceedings of GEMS'13 as well. The proceedings will again appear as a special issue of Ars Mathematica Contemporanea and will follow the high standards of this journal. The guest editors of the issue are Jozef Širáň and Martin Škoviera.

The deadline for submissions is 31st October 2013. The contributions are to be submitted through the web-page of the journal.