Invariants, Modularity, and Rights. - Ernie Cohen; Eyad Alkassar; Vladimir Boyarinov; Markus Dahlweid; Ulan Degenbaev; Mark A. Hillebrand; Bruno Langenstein; Dirk Leinenbach; Michal Moskal; Steven Obua; Wolfgang J. Paul; Hristo Pentchev; et al. (Ershov Memorial Conference, 2009)