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Math Help - rings-please help me

  1. #1
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    rings-please help me

    Let S_7={5k+35Z; k e Z/5Z}. Determine ring (S_7)^(-1) (Z/35Z)

    if there's anybody..please help me
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  2. #2
    MHF Contributor Drexel28's Avatar
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    Quote Originally Posted by tom007 View Post
    Let S_7={5k+35Z; k e Z/5Z}. Determine ring (S_7)^(-1) (Z/35Z)

    if there's anybody..please help me
    What?

    S_7=\left\{5k+35\mathbb{Z}:k\in\mathbb{Z}_5\right\  }, determine S_7^{-1}\left(\mathbb{Z}_{35}\right)?
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  3. #3
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    not Z_35 but Z / 35Z
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  4. #4
    MHF Contributor Drexel28's Avatar
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    Quote Originally Posted by tom007 View Post
    not Z_35 but Z / 35Z
    They are the same thing. I still don't actually get what the question is asking.
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  5. #5
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    oh
    well ... it just says determine the ring..
    i also don't know
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