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Vladimir G. Troitsky ([email protected]) Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta T6G 2G1 Canada, Transitive collections of operators. ABSTRACT. A collection S of linear operators on a vector space X is transitive if for every two non-zero vectors x and y in X there is an operator A in S such that Ax = y. Usually S is taken to be a subalgebra or a subspace of L(X). We investigate several conditions related to transitivity, and establish relations between them. We also consider topological and …nite-dimensional versions of these properties. 1