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Julian Schwinger calculated the leading radiative correction to the electron's magnetic moment in quantum electrodynamics. In modern notation, its anomalous part is $a_e=(g-2)/2=\alpha /(2\pi )+\cdots$, where $\alpha$ is the fine-structure constant. The small correction could be compared with magnetic and spectroscopic measurements. His 1948 paper therefore turned the interaction of the electron with the quantized field into a precise, finite prediction beyond the simplest magnetic-moment value.^[ref]

A physicist.^[ref]