, Volume 184, Issue 1, pp 109–114

Quantum probabilities and the conjunction principle


DOI: 10.1007/s11229-009-9693-7

Cite this article as:
Douven, I. & Uffink, J. Synthese (2012) 184: 109. doi:10.1007/s11229-009-9693-7


A recent argument by Hawthorne and Lasonen-Aarnio purports to show that we can uphold the principle that competently forming conjunctions is a knowledge-preserving operation only at the cost of a rampant skepticism about the future. A key premise of their argument is that, in light of quantum-mechanical considerations, future contingents never quite have chance 1 of being true. We argue, by drawing attention to the order of magnitude of the relevant quantum probabilities, that the skeptical threat of Hawthorne and Lasonen-Aarnio’s argument is illusory.


Quantum probabilitiesConjunction principleSkepticism

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Institute of PhilosophyUniversity of LeuvenLeuvenBelgium
  2. 2.Institute for History and Foundations of ScienceUtrecht UniversityUtrechtThe Netherlands