id author title date pages extension mime words sentences flesch summary cache txt work_s7vsefxgc5c53jxjedpstpjieu Clara Bradley The Non-equivalence of Einstein and Lorentz 2019 18 .pdf application/pdf 8234 518 63 (2008) that empirically equivalent theories can often be regarded as theoretically equivalent by treating one as having surplus structure, thereby present in Lorentz's theory in the form of the ether state of rest is based ξa as surplus structure, we are in e�ect equivocating between models in Newtonian spacetime related by a Galilean velocity boost, and return something vectors as Lorentz boosts do.6 In Minkowski spacetime, Maxwell's equations admit the following, observer independent formulation, where the electromagnetic surplus structure resulting in the equivalence of Lorentz and Einstein's theory. In other words, simply removing the ether state of rest from Lorentz's theory So Galilean boosts preserve the simultaneity structure of Newtonian spacetime, while Lorentz boosts do not. that corresponding to the ether state of rest does not give something structurally equivalent to Minkowski spacetime, where Einstein's theory takes place. ./cache/work_s7vsefxgc5c53jxjedpstpjieu.pdf ./txt/work_s7vsefxgc5c53jxjedpstpjieu.txt