Einstein’s proof that charge-symmetric solutions with the same mass are unavoidable, although to him a rather negative feature of his unified field theories, later was interpreted as Einstein’s discovery of the concept of antimatter ([357371Jump To The Next Citation Point], p. 78, footnote 44). To me, this seems to be a case of whiggish historical hindsight. According to Bargmann, Einstein’s lasting result is that he pointed out the importance of the discrete symmetry operations [8].