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In general the predual of a Banach space is not unique. If there are multiple ones must they be isomorphic?

More specifically is $H^1(\mathbf R^d)$ the only predual of $\text{BMO}(\mathbf R^d)$ or are there any others? If there are others, are they isomorphic?

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    @YemonChoi Thanks! I'll check it out.2012-01-07

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