2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106214In this paper we introduce the notion of timelike surface with harmonic inverse mean curvature in 3-dimensional Lorentzian space forms, and study their fundamental properties.to appear in: Proceeding of the 9th MSJ-IRI, ``Integrable Systems in Differential Geometry, Tokyo, 2000"Differential Geometry37K25; 53C42; 53C50text