Abstract.
We show that the Hardy space of functions of two variables with finite total variation is a Banach algebra under the pointwise operations and a suitably chosen norm. Then we characterize Nemytskii superposition operators, which map the Hardy space into itself and satisfy the global Lipschitz condition.
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Received 7 June 2001; in revised form 8 January 2002
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Chistyakov, V. Superposition Operators in the Algebra of Functions of Two Variables with Finite Total Variation. Monatsh. Math. 137, 99–114 (2002). https://doi.org/10.1007/s006050200048
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DOI: https://doi.org/10.1007/s006050200048