The most important contemporary development in rhetoric for the theory of argumentation is Jeanne Fahnestock's program of figural logic, the ruling insight of which is that figures epitomize arguments. Working primarily with the antimetabolic formula at the heart of Gregor Mendel's paper “Experiments in Plant Hybridization,” I investigate the figural bases of the logic anchoring this foundational essay in genetics. In addition to antimetabole, the formula also depends crucially on ploche, polyptoton, onomatopoeia, antithesis, synecdoche, reification, and metaphor.

Various argumentation analysis tools permit the analyst to represent functional components of an argument (e.g., data, claim, warrant, backing), how arguments are composed of subarguments and defenses against potential counterarguments, and argumentation schemes. In order to facilitate a study of argument presentation in a biomedical corpus, we have developed a hybrid scheme that enables an analyst to encode argumentation analysis within the framework of Rhetorical Structure Theory (RST), which can be used to represent the discourse structure of a text. This (...) paper describes the hybrid representation scheme and illustrates its use for investigation of contexts that license omission of elements of an argument. The analyses given in the paper involve reconstruction of enthymemes. Defeasible argumentation schemes serve as a constraint on reconstruction. In addition, the examples illustrate several other types of contextual constraints on reconstruction of enthymemes. (shrink)

The notions of argument and argumentation have become increasingly ubiquitous in Artificial Intelligence research, with various application and interpretations. Less attention has been, however, specifically devoted to rhetorical argument The work presented in this paper aims at bridging this gap, by proposing a framework for characterising rhetorical argumentation, based on Perelman and Olbrechts-Tyteca's New Rhetoric. The paper provides an overview of the state of the art of computational work based on, or dealing with, rhetorical aspects of argumentation, before presenting the (...) characterisation proposed, corroborated by walked-through examples. (shrink)