caa a22 4500 463183169 CHVBK 20180406164844.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10503-007-9045-z doi (NATIONALLICENCE)springer-10.1007/s10503-007-9045-z Jacquette Dale The Pennsylvania State University, 16802, University Park, PA, USA aut Deductivism and the Informal Fallacies [Elektronische Daten] [Dale Jacquette] This essay proposes and defends a general thesis concerning the nature of fallacies of reasoning. These in distinctive ways are all said to be deductively invalid. More importantly, the most accurate, complete and charitable reconstructions of these species and specimens of the informal fallacies are instructive with respect to the individual character of each distinct informal fallacy. Reconstructions of the fallacies as deductive invalidities are possible in every case, if deductivism is true, which means that in every case they should be formalizable in an expressively comprehensive formal symbolic deductive logic. The general thesis is illustrated by a detailed examination of Walter Burleigh's paradox in his c. 1323 work, De Puritate Artis Logicae Tractatus Longior (Longer Treatise on the Purity of Logic), as a challenge to the deductive validity of hypothetical syllogism. The paradox has the form, ‹If I call you a swine, then I call you an animal; if I call you an animal, then I speak truly; therefore, if I call you a swine, then I speak truly'. Several solutions to the problem are considered, and the inference is exposed as an instance of the common deductive fallacy of equivocation. Springer Science+Business Media B.V., 2007 Burleigh nationallicence Walter nationallicence deductivism nationallicence equivocation nationallicence fallacy nationallicence logical inference nationallicence medieval logic nationallicence paradox nationallicence Argumentation Springer Netherlands 21/4(2007-12-01), 335-347 0920-427X 21:4<335 2007 21 10503 https://doi.org/10.1007/s10503-007-9045-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10503-007-9045-z text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Jacquette Dale The Pennsylvania State University, 16802, University Park, PA, USA aut NATIONALLICENCE 773 0- Argumentation Springer Netherlands 21/4(2007-12-01), 335-347 0920-427X 21:4<335 2007 21 10503 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer