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Isomorphism between divisible groups

  1. Jun 5, 2012 #1
    proove that if G and H are divisible groups and there is monomorphisms from G to H and from H to G than G and H are isomorphic
  2. jcsd
  3. Jun 5, 2012 #2
    What did you try??
  4. Jun 5, 2012 #3
    i do not know how to start. i need some hint
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