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On contractive projections in Hardy spaces

Florence Lancien; Beata Randrianantoanina; Eric Ricard — 2005

Studia Mathematica

We prove a conjecture of Wojtaszczyk that for 1 ≤ p < ∞, p ≠ 2, $H_{p} ()$ does not admit any norm one projections with dimension of the range finite and greater than 1. This implies in particular that for 1 ≤ p < ∞, p ≠ 2, $H_{p}$ does not admit a Schauder basis with constant one.

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