, ... According to historian Max Jammer, this success of Sommerfeld's fine-structure formula )
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Arnold Sommerfeld generalized Bohr’s model to include elliptical orbits in three dimensions. He treated the problem relativistically (using Einstein’s formula for the increase of mass with velocity), … According to historian Max Jammer, this success of Sommerfeld’s fine-structure formula “served also as an indirect confirmation of Einstein’s relativistic formula for the velocity dependence of inertia mass.
