Cantor also began another important correspondence, with Gösta Mittag-Leffler in Sweden, and soon began to publish in Mittag-Leffler's journal Acta Mathematica.
Cantor principiou entón outra correspondencia importante co sueco Gösta Mittag-Leffler, e pronto comezou a publicar na revista Acta Mathematica de Mittag-Leffler.