ABSTRACT
Quantum electrodynamics (QED) is a theory of electron-photon interactions and is nowadays one of the most successful quantum field theories. Though the foundations of QED do not satisfy rigorous requirements of mathematics because to obtain physical results we have to operate with mathematically meaningless infinite quantities, the theory quantitatively (and with very high degree of accuracy) explains the value of electron’s anomalous magnetic moment, the Lamb shift, the hyperfine structure of hydrogen energy spectrum, atomic radiative transition line widths, and many other phenomena.
