"As everyone knows, wave mechanics was revived by Erwin Schrödinger. In his 1926 series of papers, ... the is suggested first, and then used to reserve the results of . Only later, in the sixth edition of the fourth paper, is a relativistic wave equation offered. According to Dirac, ... the history is actually quite different: Schrödinger first derived the relativistic equation, then became discouraged because it gave the wrong fine structure for hydrogen, and then some months later realized that the non-relativistic approximation to his relativistic equation was of value even if the relativistic equation was incorrect! By the time Schrödinger came to publish his relativistic wave equation, it had already been independently rediscovered by ... and , ... and for this reason it is usually called the '.'"