%0 Journal Article %T Effect algebras with state operator %A Anna jencova %A Sylvia Pulmannova %J Mathematics %D 2013 %I arXiv %X State operators on convex effect algebras, in particular effect algebras of unital JC-algebras, JW-algebras and convex sigma-MV algebras are studied and their relations with conditional expectations in algebraic sense as well as in the sense of probability on MV-algebras are shown. %U http://arxiv.org/abs/1307.4201v1