%0 Journal Article %A Karl-Hermann Neeb %T A general non-linear convexity theorem. %J Forum mathematicum %D 1997 %P 613-640 %V 9 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/FORUM_1997__9_2_141814/ %F FORUM_1997__9_2_141814