  Quantum Electrodynamics (QED) is considered the most accurate theory in the
history of science. However, this precision is limited to a single experimental
value: the anomalous magnetic moment of the electron (g-factor). The
calculation of the electron g-factor was carried out in 1950 by Karplus and
Kroll. Seven years later, Petermann detected and corrected a serious error in
the calculation of a Feynman diagram; however, neither the original calculation
nor the subsequent correction was ever published.Therefore, the entire prestige
of QED depends on the calculation of a single Feynman diagram (IIc) that has
never been published and cannot be independently verified.
