Abstract

The term "conduction" introduced by Wellman in 1971 is almost absent in the Polish literature on arguments. Contemporarily, conductive arguments are mostly understood as pro and contra arguments, which consist not only of normal pro-premises supporting a conclusion, but also of contra-premises (exceptions) denying it. We explain why such an interpretation seems to be attractive from the logical point of view, and we propose a formal method of representing conductive arguments and calculating the acceptability of their conclusions. The method allows infinitely many degrees of acceptability and reflects the cumulative nature of convergent reasoning usually present in conductive arguments.