Abstract
µ(T) of an operator T acting on a linear topological space x is defined to be the least cardinal number of Y⊂x such that
. Any Y satisfying (1.1) is called a cyclic set for T.
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Solomyak, B.M., Volberg, A.L. (1989). Multiplicity of Analytic Toeplitz Operators. In: Nikolskii, N.K. (eds) Toeplitz Operators and Spectral Function Theory. Operator Theory: Advances and Applications, vol 42. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-5587-7_3
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