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How to show that a Banach space $X$ is reflexive if and only if its dual $X'$ is reflexive?

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    First show that if $X'$ is reflexive then $X''$ is reflexive. Then what can you say about $\hat X$?2012-06-01
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    @matt: what's $\hat{X}$?2012-06-01
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    @t.b. $\hat X$ is canonical embedding of $X$ in $X''$. Sorry I should mentioned this.2012-06-01

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