2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/9688We introduce a formalism to describe 2D-Potentials for 2D-matter (or charge) distributions with arbitrary elliptical symmetry including varying eccentricity and twisting of the iso-density curves. We use this approach to describe elliptical matter distributions such as elliptical galaxies or clusters as gravitational lenses. Figures are available upon request: tschramm@hs.uni-hamburg.de7 pages, uuencoded, compressed, tar, postscript fileAstrophysicstext