buondì, vorrei annunciarvi il seminario di geometria di domani (mercoledì), siete ovviamente tutti invitati. Bruno --- MERCOLEDI' 18 SETTEMBRE 2013 14:30-15:30, Sala Seminari (Dip. Matematica) SEMINARI DI GEOMETRIA Seifert surgery network and chain links Kimihiko Motegi We propose a new approach in studying Dehn surgeries on knots in the 3--sphere yielding Seifert fiber spaces. Our basic idea is finding relationships among such surgeries. To describe relationships and get a global picture of Seifert surgeries, we introduce ``seiferters'' and the Seifert Surgery Network, a 1--dimensional complex whose vertices correspond to Seifert surgeries. We make a survey of the Seifert surgery network and then discuss some relationships between the network and chain links.