Proof that: (a) If D is an abelian group with torsion subgroup D t , then D/

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Proof that:

(a) If D is an abelian group with torsion subgroup Dt, then D/ Dt is torsion free.

(b) If D is divisible, then so is Dt, whence D = Dt⊕E, with E torsion free.

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