2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/138944Quasi-classical picture of motion of spin 1/2 massive particle in a curved spacetime is built on base of simple Lagrangian model. The one is constructed due to analogy with Lagrangian of massive vector particle. Equations of motion and spin propagation coincide with Papapetrou equations describing dynamic of classical spinning particle in a curved spacetime.9 pagesGeneral Relativity and Quantum Cosmologytext