W. V. Quine famously argues that though all knowledge is empirical, mathematics is entrenched relative to physics and the special sciences. Further, entrenchment accounts for the necessity of mathematics relative to these other disciplines. Michael Friedman challenges Quine’s view by appealing to historicism, the thesis that the nature of science is illuminated by taking into account its historical development. Friedman argues on historicist grounds that mathematical claims serve as principles constitutive of languages within which empirical claims in physics and the (...) special sciences can be formulated and tested, where these mathematical claims are themselves not empirical but conventional. For Friedman, their conventional, constitutive status accounts for the necessity of mathematics relative to these other disciplines. Here I evaluate Friedman’s challenge to Quine and Quine’s likely response. I then show that though we have reason to find Friedman’s challenge successful, his positive project requires further development before we can endorse it. (shrink)

This article criticizes the attempts by Bas van Fraassen and Michael Friedman to address the challenge to rationality posed by the Kuhnian analysis of scientific revolutions. In the paper, I argue that van Fraassen's solution, which invokes a Sartrean theory of emotions to account for radical change, does not amount to justifying rationally the advancement of science but, rather, despite his protestations to the contrary, is an explanation of how change is effected. Friedman's approach, which appeals to philosophical developments at (...) a meta-theoretical level, does not really address the problem of rationality as posed by Kuhn's work. Instead of showing how, despite revolutions, scientific development is, indeed, rational, he gives a transcendental account of rational scientific progress. (shrink)

Thomas Kuhn, dans la Structure des révolutions scientifiques, décrit les révolutions scientifiques comme des changements dans la vision scientifique du monde. Or, ce changement de vision du monde semble trouver une partie de ses racines dans la psychologie des formes. La Gestaltpsychologie a permis de remettre en cause certaines conceptions classiques de la psychologie issues de l’empirisme du xviiie siècle et par là même de penser les changements de perception non comme des changements d’interprétation, mais comme des renversements d’une structure (...) à une autre. Ces changements visuels de forme sont particulièrement bien exemplifiés dans les figures ambiguës sur lesquelles Kuhn s’appuie pour analyser le passage d’un paradigme à autre, bien que les gestaltistes, comme Köhler, aient rejeté l’hypothèse selon laquelle il serait possible de « voir » directement une signification. Reste à savoir si ces Gestalt-switches ne concernent pas davantage les historiens des sciences que les scientifiques eux-mêmes. (shrink)