2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60652We show how to calculate the Euler characteristic of an affine Jacobi variety of a spectral curve from its defining equations.8 pages, no figures, Acknowledgements are added. Typos and minor mistakes are correctedAlgebraic GeometryMathematical Physics14H40; 14H70text