Popper: Works

L’article de Karl Popper « Indeterminism in Quantum Physics and in Classical Physics » est tombé injustement dans l’oubli. Popper jugeait le déterminisme faux : l’avenir est ouvert. En principe, remplacer la variante de Laplace de la pré-détermination par une prédétermination prévisible permet de rendre scienti-fique, donc réfutable, le déterminisme « scientifique ». Popper a affirmé qu’il l’avait réfuté. Maintenant, un système métaphysique peut avoir une extension – au sens mathématique – qui le rend explicatif et testable. Si une extension (...) existe, alors elle n’est pas unique, et de nombreuses autres extensions alterna-tives existent. La preuve de Popper n’est alors pas concluante. (shrink)

Karl Popper’s “Indeterminism in Quantum Physics and in Classical Physics” suffers unjust neglect. He judged determinism false: the future is open. In principle, replacing Laplace's variant of predetermination with predictable predetermination renders “scientific” determinism scientific and so refutable. Popper claimed that he had refuted it. Now a metaphysical system may have an extension—in the mathematical sense—that may render it explanatory and testable. If it exists, then it is not unique but has many alternative extensions. Popper’s proof is then inconclusive.

In Popper's Logik der Forschung, a theoretical system is a set of sentences that describe a particular sub-area of science, in particular of empirical science. The goal of axiomatizing a theoretical system is to specify a small number of "axioms" describing all presuppositions of the sub-area under consideration, so that all other sentences of this system can be derived from them by means of logical or mathematical transformations. The paper discusses two philosophical interpretations of these proper axioms. First, proper axioms (...) stipulate the use of the signs for the basic concepts of the system. Consequently, the proper axioms turn out to be analytic relative to a class of interpretations of the underlying logic. Hence, they cannot be falsified by refuting their logical consequences because these consequences are analytic as well. Secondly, proper axioms are synthetic, falsifiable and uncertain sentences. Hence, they are not immunized against falsification by refuting their logical consequences. (shrink)

Over the last four decades arguments for and against the claim that creative hypothesis formation is based on Darwinian ‘blind’ variation have been put forward. This paper offers a new and systematic route through this long-lasting debate. It distinguishes between undirected, random, and unjustified variation, to prevent widespread confusions regarding the meaning of undirected variation. These misunderstandings concern Lamarckism, equiprobability, developmental constraints, and creative hypothesis formation. The paper then introduces and develops the standard critique that creative hypothesis formation is guided (...) rather than blind, integrating developments from contemporary research on creativity. On that basis, I discuss three compatibility arguments that have been used to answer the critique. These arguments do not deny guided variation but insist that an important analogy exists nonetheless. These compatibility arguments all fail, even though they do so for different reasons: trivialisation, conceptual confusion, and lack of evidence respectively. Revisiting the debate in this manner not only allows us to see where exactly a ‘Darwinian’ account of creative hypothesis formation goes wrong, but also to see that the debate is not about factual issues, but about the interpretation of these factual issues in Darwinian terms. (shrink)

Despite being a staple of liberal-democratic politicians’ and theorists’ rhetorical arsenal, ‘openness’ as a political commitment has yet to receive sustained philosophical analysis. My aim in this paper is to provide such an analysis. I will argue that political openness involves a readiness by an agent to engage with others forthrightly and receptively, and to recognise their authoritative standing in political domains. I demonstrate the explanatory value of this account by showing that it provides an insightful explanation of what’s at (...) stake in the emerging political cleavage between ‘open’ and ‘closed’ politics, explains the appeal of ‘the open society’ as an epithet for liberal democracies, and provides a compelling interpretation of openness’ contribution to social dynamism and progressive reform, one which diverges favourably from the emphasis others have put on social experimentation and trial and error learning. (shrink)