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${{\mathbb{T}}^{N}}$ and
${{\mathbb{R}}^{N}}$ Published online by Cambridge University Press: 20 November 2018
Let
$N$ be an integer which is larger than one. In this paper we study invariant subspaces of
${{L}^{2}}({{\mathbb{T}}^{N}})$ under the double commuting condition. A main result is an
$N$ -dimensional version of the theorem proved by Mandrekar and Nakazi. As an application of this result, we have an
$N$ -dimensional version of Lax's theorem.