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Math Help - not ring isomorphic

  1. #1
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    not ring isomorphic

    Hey guys
    how do you show if 2Z/8Z are subrings that is isomorphic to the group Z4?
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  2. #2
    Member ModusPonens's Avatar
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    Re: not ring isomorphic

    Find the 4 cosets of 2Z/8Z and think of a natural bijection. Find if that bijection is also a ring homomorphism.
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