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secondary 46j15

Glasgow Mathematical Journal (1)

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NORM CLOSED INVARIANT SUBSPACES IN $L^{\infty}$ AND $H^\infty$
KEIJI IZUCHI, DANIEL SUÁREZ
Journal:

Glasgow Mathematical Journal / Volume 46 / Issue 2 / May 2004

Published online by Cambridge University Press:

19 May 2004, pp. 399-404

Print publication:

May 2004
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We characterize norm closed subspaces $B$ of $\linf (\partial D)$ such that $C(\partial D) B \subset B$ and maximal ones in the family of proper closed subspaces $B$ of $L^\infty(\partial D)$ such that $A(D) B \subset B$, where $A(D)$ is the disk algebra. Analogously, we characterize closed subspaces of $H^\infty$ that are simultaneously invariant under $S$ and $S^\ast$, the forward and the backward shift operators, and maximal invariant subspaces of $H^\infty$.