1. Michel Ghins & Tim Budden (2001). The Principle of Equivalence. Studies in History and Philosophy of Science Part B 32 (1):33-51.
    We start from John Norton's analysis (1985) of the reach of Einstein's version of the principle of equivalence which is not a local principle but an extension of the relativity principle to reference frames in constant acceleration on the background of Minkowski spacetime. We examine how such a point of view implies a profound, and not generally recognised, reconsideration of the concepts of inertial system and field in physics. We then reevaluate the role that the infinitesimal principle, if adequately formulated, (...)
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  2. Tim Budden (1997). Galileo's Ship and Spacetime Symmetry. British Journal for the Philosophy of Science 48 (4):483-516.
    The empirical content of the modern definition of relativity given in the Andersonian approach to spacetime theory has been overestimated. It does not imply the empirical relativity Galileo illustrated in his famous ship thought experiment. I offer a number of arguments—some of which are in essential agreement with a recent analysis of Brown and Sypel [1995]—which make this plausible. Then I go on to present example spacetime theories which are modern relativistic but violate Galileo's relativity. I end by briefly discussing (...)
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  3. Tim Budden (1992). The Relativity Principle and the Isotropy of Boosts. PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1992:528 - 541.
    A class of theories which satisfy the Relativity Principle has been overlooked. The kinematics for these theories is derived by relaxing the 'boost isotropy' symmetry normally invoked, and the role the dynamical fields play in determining the inertial coordinate systems is emphasised, leading to a criticism of Friedman's (1983) practice of identifying them via the absolute objects of a spacetime theory alone. Some theories complete with 'boost anisotropic' dynamics are given.
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