Abstract
1. M. L. Curtis and M. K. Fort, Jr., Homotopy groups of one-dimensional spaces, Proc. Amer. Math. Soc. vol. 8 (1957) pp. 577-579. 2. S. Eilenberg and S. MacLane, Relations between homology and homotopy groups of spaces, Ann. of Math. vol. 46 (1945) pp. 480-509. 3. M. K. Fort, Jr., Mappings of S' into one-dimensional spaces, Illinois J. Math. vol. 1 (1957) pp. 505-508. 4. H. B. Griffiths, Infinite products of semigroups and local connectivity, Proc. London Math. Soc. (1956) pp. 455-480.
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