2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/73214In this talk we introduce several topics in combinatorial number theory which are related to groups; the topics include combinatorial aspects of covers of groups by cosets, and also restricted sumsets and zero-sum problems on abelian groups. A survey of known results and open problems on the topics is given in a popular way.23 pagesGroup TheoryCombinatorics20D60; 05A05; 11B25; 11B75; 11P70text