Annals of the Japan Association for Philosophy of Science
Online ISSN : 1884-1228
Print ISSN : 0453-0691
ISSN-L : 0453-0691
Volume 4 , Issue 3
Showing 1-4 articles out of 4 articles from the selected issue
  • Yoshio UENO
    1973 Volume 4 Issue 3 Pages 157-169
    Published: March 31, 1973
    Released: February 16, 2009
    JOURNALS FREE ACCESS
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  • E.P. WIGNER, M.M. YANASE
    1973 Volume 4 Issue 3 Pages 171-186
    Published: March 31, 1973
    Released: February 16, 2009
    JOURNALS FREE ACCESS
    The quantum mechanical measurement process is analysed in detail, especially from the group theoretical point of view. The first three chapters review the results obtained before briefly. In §1, the classical theory of measurement, originated by von Neumann, is birefly described. The importance of considering more general schemes of measurements than the original one is, however, emphasized. In §2, the role of conservation laws, in imposing limitations on the possibility of measurements, is discussed. Accurately measurable quantities are defined in this context. In §3, the role of conservation laws is further analysed. It is shown that the conserved quantity of the apparatus cannot be used for a “pointer reading.”
    The following two chapters discuss the nature of the exactly measurable quantities. In §4, exactly measurable quantities are explicitly determined. It is shown that the measurement of projection operators in the Hilbert space of the object which commute with the operators of the restricted Poincaré group give all the information on the states of the object that can be obtained by accurate measurements. In §5, the measurement on objects which are composed of more than one particle is discussed.
    The last chapter, §6, deals with approximately measurable quantities, but no complete estimate of the unavoidable inaccuracy of the measurement of these is obtained. It also contains some concluding remarks.
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  • Carl G. HEMPEL
    1973 Volume 4 Issue 3 Pages 187-202
    Published: March 31, 1973
    Released: February 16, 2009
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  • Gerald J. MASSEY
    1973 Volume 4 Issue 3 Pages 203-212
    Published: March 31, 1973
    Released: February 16, 2009
    JOURNALS FREE ACCESS
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