The author deals with the operational core oflogic, i.e. its diverse procedures ofinference, in order to show that logicallyfalse inferences may in fact be right because –in contrast to logical rationality – theyactually enlarge our knowledge of the world.This does not only mean that logically trueinferences say nothing about the world, butalso that all our inferences are inventedhypotheses the adequacy of which cannot beproved within logic but only pragmatically. Inconclusion the author demonstrates, through therelationship between rule-following andrationality, that it is (...) most irrational to wantto exclude the irrational: it may, at times, bemost rational to think and infer irrationally.Focussing on the operational aspects of knowingas inferring does away with the hiatus betweenlogic and life, cognition and the world(reality) – or whatever other dualism one wantsto invoke –: knowing means inferring, inferringmeans rule-governed interpreting, interpretingis a constructive, synthetic act, and aconstruction that proves adequate (viable) inthe ``world of experience'', in life, in thepraxis of living, is, to the constructivistmind, knowledge. It is the practice of livingwhich provides the orienting standards forconstructivist thinking and its judgments ofviability. The question of truth is replaced bythe question of viability, and viabilitydepends on the (right) kind of experiential fit. (shrink)

Although the expression “form of life” and its plural “forms of life” occur only five times in Philosophical Investigations, and generally few times in his works, it is commonly agreed that this is one of the most relevant issues in Wittgenstein’s later philosophy. Starting from the analysis of the contexts in which Wittgenstein makes use of this concept, the paper focuses on the different interpretations that have been given in secondary literature, and proposes a classification based on two axes of (...) debate: the monistic versus pluralistic interpretation, and the empirical versus transcendental interpretation. After placing some well-known readings in the resulting scheme, an attempt will be made to offer an evolutionary reading of Wittgenstein’s own ideas about forms of life. It will be argued that the empirical and plural view that seems characteristic of his writings in the Thirties, slowly appears to turn towards a monistic view, sometimes with transcendental tones, although within a pragmatic perspective. This turn remains nevertheless rooted in Wittgenstein’s general attitude towards philosophy intended as a conceptual inquiry with clarifying and therapeutic aims. (shrink)