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In spite of the impressive success of quantum mechanics in describing atomic physics, it was immediately clear after its formulation that its relativistic extension was not free of difficulties.

— Luis Álvarez-Gaumé An Invitation to Quantum Field Theory (2012)

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More quotes by Luis Álvarez-Gaumé

If Dirac’s idea restores the stability of the spectrum by introducing a stable vacuum where all negative energy states are occupied, the so-called Dirac sea, it also leads directly to the conclusion that a single-particle interpretation of the Dirac equation is not possible.

An Invitation to Quantum Field Theory (2012)

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