2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67825Quantum ergodicity of classically chaotic systems has been studied extensively both theoretically and experimentally, in mathematics, and in physics. Despite this long tradition we are able to present a new rigorous result using only elementary calculus. In the case of the famous Bunimovich billiard table we prove that the wave functions have to spread into any neighbourhood of the wings.4 pages, 2 picturesAnalysis of PDEsMathematical Physicstext