Intrinsic Argument Strength in Structured Argumentation: a Principled Approach
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Abstract argumentation provides us with methods such as gradual and Dung semantics with which to evaluate arguments after potential attacks by other arguments. Some of these methods can take in- trinsic strengths of arguments as input, with which to modulate the effects of attacks between argu- ments. Coming from abstract argumentation, these methods look only at the relations between argu- ments and not at the structure of the arguments themselves. In structured argumentation the way an argument is constructed, by chaining inference rules starting from premises, is taken into consider- ation. In this thesis we study methods for assign- ing an argument its intrinsic strength, based on the strengths of the premises and inference rules used to form said argument. We first define a set of prin- ciples, which are properties that strength assigning methods might satisfy. We then propose two such methods and analyse which principles they satisfy. Finally, we present a generalised system for creat- ing novel strength assigning methods and speak to the properties of this system regarding the proposed principles.