2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87702A semiclassical Foldy--Wouthuysen transformation of the Dirac equation is used to obtain the radiationless Bloch equation for the polarisation density.7 pages. No figures. Latex. Paper 5 of a set of 5. others are physics/9901038 physics/9901041 physics/9901042 physics/9901043Accelerator PhysicsClassical PhysicsQuantum PhysicsV. The Semiclassical Foldy-Wouthuysen Transformation and the Derivation of the Bloch Equation for Spin-1/2 Polarised Beams Using Wigner Functionstext