Max Planck was the first one, a mathematician, who understood Einstein's theories of relativity. Early on Einstein's hypotheses were considered as physical fictions.The special hypothesis of relativity was published in 1905 supplemented with the elaboration of E = mc (squared) in 1906. The first discovery along this formula was done by Enrico Fermi in 1936 and confirmed and named as "fission" by Lise Mietner and company in 1938. The generalized hypothesis of relativity was published in 1915 and verified in 1919 by Sir Arthur Eddington. After verification, these hypotheses graduated into theories.