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In 1971, Fefferman characterized the predual of $BMO(\mathbb{R}^d)$ as the Hardy space $H^1(\mathbb{R}^d)$.

Is there a characterization of the predual of $BMO(\mathbb{T}^d$)?

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    $\begingroup$ predual, not dual. $\endgroup$
    – Terry Tao
    Commented Jan 7, 2021 at 1:01
  • $\begingroup$ thank you I corrected this and the year of Fefferman's result. $\endgroup$
    – Jules Pitcho
    Commented Jan 7, 2021 at 10:30

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