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Homework Help: Abstract algebra (ring theory)

  1. Dec 6, 2008 #1
    Let R be the set of all a in rational numbers in whose reduced form the denominator is not divisible by a fixed prime p. Verify R is a ring under the usual addition and multiplication in rational numbers. Find all invertible elements in R.
     
  2. jcsd
  3. Dec 6, 2008 #2

    Hurkyl

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    Done! How about you?
     
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