Algebraic Geometry and Complex Analysis : Proceedings of the Workshop held in Pátzcuaro Michoacán México Aug. 10–14 1987 The addition theorem for abstract theta functions Existence of certain universal extensions On a property of the kummer variety and a relation between two moduli spaces of curves The bi weighted euler sequence on scrolls On closed leaves of holomorphic foliations by curves Fays triscecant formula Fitting ideals and multiple points of analytic mappings Certain weierstrass points occure at most once on a curve The gauss map on subvarieties of jacobians of curves with g d 2 s.