2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153617We study the algebra of difference operators that commute with the two-body Ruijsenaars operator, a $q$-deformation of the Lamé differential operator, for generic values of the deformation parameter. The algebra is commutative. It is the algebra of polynomial functions on an affine hyperelliptic curve $Y^2=P(X^2)$. We also compute the difference Galois group of the eigenvalue problem.17 pages, amslatexQuantum AlgebraHigh Energy Physics - Theorytext