On defense strength of blocking defeaters in admissible sets

DIEGO C. MARTINEZ; ALEJANDRO J. GARCÍA; GUILLERMO R. SIMARI

Conferencia; Second Int. Conf. on Knowledge Science, Engineering and Management KSEM 2007; 2007

 Extended argumentation framework is a formalism wheredefeat relations are determined by establishing a preference between ar-guments involved in symmetric conflicts. This process possibly leads toblocking situations, where conflicting arguments are found to be incom-parable or equivalent in strength. In this work we introduce new argu-mentation semantics for extended frameworks, by taking into account thestrength of an argument defense. Each of these new admissibility notionsrelies on the presence of blocking defeaters as argument defenders.