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In the last two decades, theories explaining the same experiments as well asspecial relativity does, were developed by using different synchronizationprocedures. All of them are ether-like theories. Most authors believe thesetheories to be equivalent to special relativity, but no general proof was everbrought. By means of a Gedankenexperiment on light aberration, we producestrong evidence that this is the case for experiments made in inertial systems.Comment: 9 pages, Latex, 2 figures already included in the main fil

Aberration and the question of equivalence of some ether theories to special relativity