%0 Journal Article %T O-operators on associative algebras and dendriform algebras %A Chengming Bai %A Li Guo %A Xiang Ni %J Mathematics %D 2010 %I arXiv %X An O-operator is a relative version of a Rota-Baxter operator and, in the Lie algebra context, is originated from the operator form of the classical Yang-Baxter equation. We generalize the well-known construction of dendriform dialgebras and trialgebras from Rota-Baxter algebras to a construction from O-operators. We then show that this construction from O-operators gives all dendriform dialgebras and trialgebras. Furthermore there are bijections between certain equivalence classes of invertible O-operators and certain equivalence classes of dendriform dialgebras and trialgebras. %U http://arxiv.org/abs/1003.2432v2