Foundations of Physics

, Volume 10, Issue 5–6, pp 499–501 | Cite as

The rotating disk: Reply to Grünbaum and Janis

  • Øyvind Grøn


Using the time orthogonal spatial line element, which characterizes the spatial geometry inside a given reference frame in a coordinate-invariant way, the condition for uniform rotating motion without tangential strain is deduced. The results are the same as those previously found by Grunbaum and Janis using another method, and shows that my earlier criticism of their work is not valid.


Reference Frame Line Element Tangential Strain Spatial Geometry Early Criticism 
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  1. 1.
    A. Grünbaum and A. J. Janis,Found. Phys., this issue, preceding paper.Google Scholar
  2. 2.
    Ø. Grøn,Found. Phys. 9, 353 (1979).Google Scholar
  3. 3.
    A. Grünbaum and A. J. Janis,Synthèse 34, 281 (1977).Google Scholar

Copyright information

© Plenum Publishing Corporation 1980

Authors and Affiliations

  • Øyvind Grøn
    • 1
  1. 1.Fysisk Institutt, TeorigruppenOsloNorway

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