Richard D. Byrd, Justin T. Lloyd, Roberto A. Mena, J. Roger Teller, "Extensions of group retractions", International Journal of Mathematics and Mathematical Sciences, vol. 3, Article ID 501712, 12 pages, 1980. https://doi.org/10.1155/S016117128000052X
Extensions of group retractions
In this paper a condition, which is necessary and sufficient, is determined when a retraction of a subgroup of a torsion-free group can be extended to a retraction of . It is also shown that each retraction of a torsion-free abelian group can be uniquely extended to a retraction of its divisible closure.
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