I want to know the answer to the following question:
What name did Paul Ehrenfest give to the proofs from Einstein and Rayleigh & Jeans?
All the background I'm provided with is that "The black-body problem was revisited in 1905, when Rayleigh and Jeans (on the one hand) and Einstein (on the other hand) independently proved that classical electromagnetism could never account for the observed spectrum.". Is that enough to answer the question?