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Paul A. M. Dirac
Theory of electrons and positrons
Nobel Lecture, December 12, 1933
...
If we accept the view of complete symmetry between positive and negative
electric charge so far as concerns the fundamental laws of Nature, we
must regard it rather as an accident that the Earth (and presumably the
whole solar system), contains a preponderance of negative electrons and
positive protons. It is quite possible that for some of the stars it is the other
way about, these stars being built up mainly of positrons and negative protons.
...
δ+δ-