2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/113934This paper presents a number of problems about mapping class groups and moduli space. The paper will appear in the book "Problems on Mapping Class Groups and Related Topics", ed. by B. Farb, Proc. Symp. Pure Math. series, Amer. Math. Soc.Slightly revised from author-distributed version. Subsection on nonpositive curvature metrics addedGeometric TopologyGroup Theory58D29; 20F38;30F60;14D22;57M99;20F34text