2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50547We consider Dirac's free electron theory on the first quantized level. We decompose its canonical spin current á la Gordon and find a conserved ``Gordon spin'' current which turns out to be equivalent to the Hilgevoord-Wouthuysen spin. We can conclude therefrom that the Gordon-type decomposition mentioned above corresponds to a Foldy-Wouthuysen transformation which transforms the Dirac wave function from the conventional Dirac-Pauli to the Newton-Wigner representation.LaTeX file, 36 pagesHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext