Ceteris Paribus Laws and Argumentation Schemes
Ceteris Paribus Laws and Argumentation Schemes
DOI:
https://doi.org/10.30854/cnmq5v77Keywords:
Ceteris paribus laws, argumentation schemes, ranking theory, defeasible reasoning, informal logic, epistemic normativity, normality of conditions, (obtained from the UNESCO Thesaurus).Abstract
Objective: The present paper discusses an account on the epistemological foundation of argumentation schemes through the defeasible reasoning theory of ranking beliefs and the ceteris paribus defeasible approach of Wolfgang Spohn (2012). Hence, the purpose is to model a general scheme of reasoning for any argumentation scheme given Spohn’s ceteris paribus conditions model. Methodology: Spohn’s proposal of a general form of normality ceteris paribus laws is capable of being used as an a priori model to every kind of defeasible reasoning normativity, including argumentation schemes in the field of the informal logic. Results: The main result is the structure of a general scheme of reasoning for any argumentation scheme: 1. A is a necessary and sufficient reason to believe in B, iff given that believe in (B/A)>0≥ believe in (B/-A) and believe in (B/A)≥0>believe in (B/-A), that is to say, Ceteris paribus; 2. A is the case; 3. therefore, B must be believed. Conclusions: Normality of conditions is related to a centered epistemic agent in a given background. We believe defeasible a priori the ceteris paribus hypothesis and then we start the use of the mechanism of argumentation scheme. Argumentation schemes are either stereotypical pattern of defeasible reasoning, when the premises only support with likelihood and other things being normal, the acceptance of the conclusion. Practical reasoning is, then, defeasible in essence.
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