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One question related to an ideal of Ring R

  1. Jan 24, 2008 #1
    Let a and b belong to a commutative ring R. Prove that { x ∈ R | ax∈bR } is an ideal.

    i really need help

  2. jcsd
  3. Jan 24, 2008 #2
    just use the definition of an ideal, where are you stuck exactly
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