Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finiteness of a non-commutative ring

  1. Apr 24, 2010 #1
    Let R be a non-commutative ring . Suppose that the number of non-units of R is finite . Can we say that R is a finite ring?
  2. jcsd
  3. Apr 24, 2010 #2
    If R and F are rings, then RxF is a ring. In particular, if R is a finite non-commutative ring and F is a field...
  4. Apr 25, 2010 #3
    so then??...
  5. Apr 26, 2010 #4


    User Avatar
    Science Advisor

    then RxF is an infinite non-commutative ring...
  6. Apr 26, 2010 #5
    Do you mean that RxF is a counter-example ? but RxF has infinite non-unit elements .
  7. Apr 26, 2010 #6
    Silly me! I should read the question.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook