2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67846We prove that for generic geometry, the curl-eigenfield solutions to the steady Euler equations on the three torus are all hydrodynamically unstable (linear, L^2 norm). The proof involves a marriage of contact topological methods with the instability criterion of Friedlander-Vishik. An application of contact homology is the crucial step.Dynamical SystemsSymplectic Geometry76E09; 37J55; 76B99; 53D40text