2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89167The Moyal formalism for a particle can be derived from the Moyal formalism for a spin. This is done by contracting the group of rotations to the oscillator group. A new derivation is given for the contraction of the spin Wigner-kernel to the Wigner kernel of a particle.5 pages, Latex, Proceedings of the XIII International Colloquium on Group Theoretical Methods in Physics, 31 July - 5 August 2000, Dubna, RussiaQuantum Physicstext