Abstract

It has been suggested that we ought to idealize the apparatus used to measure quantum systems as consisting of an infinite number of particles. Various authors have claimed that if we do so we do not need to take seriously the limitations on measurement incorporated into the Wigner-Araki-Yanase quantum theory of measurement. Bub and claims we can solve the measurement problem if we make this assumption. I argue against both claims on the basis of differences between the role of such idealizations in classical and quantum mechanics