We study the composition operators of the Hardy space on $$\mathbb D^\infty \cap \ell _1$$ D ∞ ∩ ℓ 1 , the $$\ell _1$$ ℓ 1 part of the infinite polydisk, and the behavior of their approximation numbers.
Integral Equations and Operator Theory – Springer Journals
Published: Nov 1, 2017
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