Wilson, J.P. and Clarke, C.J.S.
`Elementary flatness' on a symmetry axis
Classical Quantum Gravity, 13, . (doi:10.1088/0264-9381/13/7/025).
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The conditions of elementary flatness, trivial behaviour under parallel propagation of frames, and regularity to various degrees of differentiability, are given precise definitions and related to practical criteria. As an example, their relations are explored in the case of cylindrically symmetrical stationary dust.
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