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Published online by Cambridge University Press: 20 November 2018
It is proved that if a positive operator $S\,:\,E\,\to \,F$ is
$\text{AM}$-compact whenever its adjoint
${{S}^{'}}:{{F}^{'}}\to {{E}^{'}}$ is
$\text{AM}$-compact, then either the norm of
$\text{F}$ is order continuous or
$E\prime $ is discrete.