Revision as of 19:10, 8 April 2009 by Aifrank (Talk | contribs)

  • Show that $ Phi_n(x) $ is reducible if $ n $ is not prime.

Think I might be stumped on this problem. I was thinking to show that Eisenstein fails when n isn't prime, but I'm not sure how to do that. ---

something by using the counter...?

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Basic linear algebra uncovers and clarifies very important geometry and algebra.

Dr. Paul Garrett