Publication Date:
1980-01-01
Description:
In this paper a condition, which is necessary and sufficient, is determined when a retraction of a subgroupHof a torsion-free groupGcan be extended to a retraction ofG. It is also shown that each retraction of a torsion-free abelian group can be uniquely extended to a retraction of its divisible closure.
Print ISSN:
0161-1712
Electronic ISSN:
1687-0425
Topics:
Mathematics
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