2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27366We investigate Bethe Ansatz equations for the one-dimensional spin-$\frac{1}{2}$ Heisenberg XXX chain with a special interest in a finite system. Solutions for the two-particle sector are obtained. The ground state in antiferromagnetic case has been analytically studied through the logarithmic form of Bethe Ansatz equations.21 pages, latex, 2 figures in a seperate fileCondensed Mattertext