Proof that The direct sum of a family of free abelian groups is a free abelian group.
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Proof that The direct sum of a family of free abelian groups is a free abelian group. (A direct product of free abelian groups need not be free abelian).
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Algebra Graduate Texts In Mathematics 73
ISBN: 9780387905181
8th Edition
Authors: Thomas W. Hungerford
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