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A commutative ring with unity and Ideals

  1. Mar 23, 2010 #1
    Let R be a commutative ring with unity. I and J are ideals of R.
    Show that If I + J = R, then I∩J=IJ.

    I know that IJ⊆(I∩J).
    But I can't do inverse.
    Last edited: Mar 23, 2010
  2. jcsd
  3. Mar 23, 2010 #2
    I solve it!
    Thus no answer is required. :)
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