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 -- Fay's 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