Geodesic
$J$-closed finite collections of Hardy-type subspaces
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 40, Tome 401 (2012), pp. 82-92 Cet article a éte moissonné depuis la source Math-Net.Ru

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Several proofs of the following statement are given: if $X^0,\dots,X^n$ are BMO-regular lattices on the circle and $x\in X^0\cap\dots\cap X^n$, then the distances from $x$ to the Hardy-type subspaces $X^j_A$ are roughly attained at one and the same element of $\bigcap_jX^j_A$. 
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P. Ivanishvili. $J$-closed finite collections of Hardy-type subspaces. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 40, Tome 401 (2012), pp. 82-92. http://geodesic.mathdoc.fr/item/ZNSL_2012_401_a3/

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