2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93986Spin coherent states play a crucial role in defining QESM (quasi-exactly solvable models) establishing a strict correspondence between energy spectra of spin systems and low-lying quantum states for a particle moving in a potential field of a certain form. Spin coherent states are also used for finding the Wigner-Kirkwood expansion and quantum corrections to energy quantization rules. The closed equation which governs dynamics of a quantum system is obtained in the spin coherent representation directly for observable quantities.7 pages, RevTex 3.0. Talk given at the 22nd International Colloqium for Group Theoretical Methods in PhysicsQuantum PhysicsCondensed MatterHigh Energy Physics - TheoryMathematical PhysicsRepresentation TheorySpectral Theorytext