Abstract

Ehrenfest’s paradox is examined within the framework of combined relativity; it means there would be a move from a 2D problem to a 3D problem. By combining special with general relativity, a mathematical solution involving 3D seems to exist. The paradox would disappear: the radius causing the paradox would curve in the third dimension to correspond to the contracted 2D circumference. But the mathematical solution seems incomplete as it includes only one contraction; until now, combined relativity involves two contractions. If the special relativistic part of combined relativity is abandoned, the mathematical solution would be a possibility and general relativity alone would explain the contraction expected with a rotating disk.

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