Fallacies The Revival of Fallacy Theory in 1970. Selected Historical Glimpses. The title is a provocation, of course, a likely satisfier of its own predicate. Even so, the intent of the paper is seriously to propose that all the vital elements of postmodernism are to be found doing indispensable work in some of this century's most celebrated technical philosophy. We shall examine central issues in set theory and truth conditional semantics.
All actions have the capability of succeeding or failing.
After distinguishing between imprecision and uncertainty, we focus on the quantified representations of uncertainty, considering weighted imprecision only in its relation to uncertainty. We restrict ourselves on the theories with well structured foundations leaving aside ad hoc theories. We successively define the concept of support, the frame on which uncertainty is defined and the concepts of actual worlds, of 'evidential corpus' and of the 'support state' that describes the agent's opinion about which of the possible worlds is the actual world. We then proceed by describing the various theories for representing quantified uncertainty, those based on probability functions, on possibility functions and on belief functions. In this talk, we will give a brief introduction to this rapidly developing field and outline the key principles.