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  • ...e-time diffeomorphisms. Algebraic and differential comitants of the linear map are discussed, their physical roles are identified. The impedance of a medi
    12 KB (1,864 words) - 12:40, 30 December 2016
  • ...ond restricted to lightlike separation) leads to a yet larger group, the [[conformal group]] of spacetime.</ref> Equation {{EquationNote|(D3)}} can be written m ...curve can always be taken as an exponential as the exponential will always map {{math|''G''}} smoothly back into the group via {{math|''t'' → exp(''tG''
    97 KB (14,188 words) - 15:44, 20 July 2017
  • ...., the [[spherical wave transformation]]s, being a form of [[Conformal map|conformal transformations]]. Under those transformations the equations preserve their
    130 KB (18,278 words) - 13:48, 14 February 2019