2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/212045Weyl's expansion for the asymptotic mode density of billiards consists of the area, length, curvature and corner terms. The area term has been associated with the so-called zero-length orbits. Here closed nonperiodic paths corresponding to the length and corner terms are constructed.8 pages, 2 figuresQuantum Physicstext