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    Boolean powers of abelian groups.Katsuya Eda - 1990 - Annals of Pure and Applied Logic 50 (2):109-115.
  2.  14
    Trees, fundamental groups and homology groups.Katsuya Eda & Masasi Higasikawa - 2001 - Annals of Pure and Applied Logic 111 (3):185-201.
    For a tree T of its height equal to or less than ω1, we construct a space XT by attaching a circle to each node and connecting each node to its successors by intervals. is the Hawaiian earring and H1T denotes a canonical factor of the first integral singular homology group. The following equivalences hold for an ω1-tree T: π1 is embeddable into π1, if and only if is embeddable into H1T, if and only if T is not an Aronzajn (...)
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