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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.

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

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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.

An Invitation to Quantum Field Theory (2012)

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Quote text and notes from Wikiquote: Luis Álvarez-Gaumé (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.