Topology and its Applications, 2015 \textit{P. R. Halmos} [Bull. Am. Math. Soc. 50, 877--878 (1944; Zbl 0061.04404)] raised interest in the problem of characterizing those abelian groups which can be made into compact (Hausdorff) topological groups. In the case of infinite free abelian groups, the answer is well-known to be negative; however, there is interest in the problem of endowing ...
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