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In this article we continue to study the concept of entropy introduced in[4], [15]-[17]. We calculate entropy for a wider class of finite-dimensionaloperators in comparison with [15]. We also approximate the entropy of a unitaryoperator on $l^2(\mathbb{N}_0)$ by the entropy of finite-dimensional operators.Finally we calculate the entropy of several operators on $l^2(\mathbb{N}_0)$.

Entropy of a unitary operator on $l^2(\mathbb{N}_0)$