G. W. Leibniz developed a new model for rational decision-making which is suited to complicated decisions, where goods do not rule each other out, but compete with each other. In such cases the deliberator has to consider all of the goods and pick the ones that contribute most to the desired goal which in Leibniz’s system is ultimately the advancement of universal perfection. The inclinations to particular goods can be seen as vectors leading to different directions much like forces in (...) Leibniz’s dynamics. The vectorial model of rational decision-making is related to Leibniz’s work with metaphysical physics and the calculus of variations and is a heuristic tool which helps in finding reasonable combinations – in ideal cases optimums - between competing goods. By applying the model, the decision-maker can map and compare outcomes of combinations of goods in question and practice a kind of pseudo-mechanical arithmetic of reasons. A central feature of the model is the possibility to employ geometrical figures to help the conceptualization. In this paper I present the vectorial model, examine its applications in practical cases from political theory, jurisprudence and ethics Leibniz presented, and compare the model to recent theories of acting under uncertainty, such as bounded rationality and optimizing under constraints. (shrink)

This article is devoted to the historical roots of the quest for rigor associated with analytic philosophy. Starting out from distinctions between different senses of “rigourµ, it considers the rather diverse conceptions and pursuits of rigour in Frege, Russell, Moore, Wittgenstein and Carnap. On that basis it diagnoses a potential conflict that some of them were aware of, but that has been ignored by recent commentators, namely between certain kinds of rigour on the hand, clarity and surveyability on the other. (...) That conflict is related to the contrast between formal and non-formal ways of pursuing rigour. Frege, Wittgenstein and Carnap occupy distinct positions concerning both issues. Nevertheless, all three are united with n the hope to achieve philosophical progress by means of clear questions and statements put in the service of rigorous argument. (shrink)