An abstract argumentation framework with proper and blocking defeaters

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

La Matanza, Provincia de Buenos Aires

Congreso; X Congreso Argentino de Ciencias de la Computación; 2004

Universidad Nacional de La Matanza - Red de Universidades Nacionales con Carreras en Informática

Defeat between arguments is a combination of two basic elements: a conflict relation and a preference order. We present a framework for argumentation where two kinds of defeat relation are present, depending on the outcome of a preference function sigma. An argument A is a proper defeater of B, if both arguments are in conflict, and A is preferred to B according to sigma. A is a blocking defeater of B, if they are in conflict and both arguments are incomparable or indistinguishable. We define a function to caracterize the set of accepted argument in the framework. This function also provide a method for identifying controversial situations.