Foundations of Physics

, Volume 21, Issue 1, pp 25–42 | Cite as

Measurement and “beables” in quantum mechanics

  • Jeffrey Bub
Part IV. Invited Papers Dedicated To John Stewart Bell


It is argued that the measurement problem reduces to the problem of modeling quasi-classical systems in a modified quantum mechanics with superselection rules. A measurement theorem is proved, demonstrating, on the basis of a principle for selecting the quantities of a system that are determinate (i.e., have values) in a given state, that after a suitable interaction between a systemS and a quasi-classical systemM, essentially only the quantity measured in the interaction and the indicator quantity ofM are determinate. The theorem justifies interpreting the noncommutative algebra of observables of a quantum mechanical system as an algebra of “beables,” in Bell's sense.


Quantum Mechanic Mechanical System Measurement Problem Quantum Mechanical System Superselection Rule 
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Copyright information

© Plenum Publishing Corporation 1991

Authors and Affiliations

  • Jeffrey Bub
    • 1
  1. 1.Department of PhilosophyUniversity of MarylandCollege Park

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