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Jun 25, 2013 at 3:02 review Late answers
Jun 26, 2013 at 0:06
Apr 7, 2011 at 0:35 comment added Burton Newman That's a good point!
Apr 4, 2011 at 22:57 comment added darij grinberg What we DO use here is the existence of a primitive $a_n$-th root of unity. This is somewhat tricky if we wish to avoid analysis, but many books do it right.
Apr 4, 2011 at 22:56 comment added darij grinberg ... one doesn't.
Apr 4, 2011 at 22:56 comment added darij grinberg While I absolutely don't want to ruin Doron's wonderful polemic, let me add that the "complex-analytic" proof he quotes is completely algebraic. Just look at it from the correct angle: We take the equation (MNDR) and rewrite it as $\frac{1}{1-z}-\sum_{i=1}^{n-1} \frac{z^{b_i}}{1-z^{a_i}} = \frac{z^{b_n}}{1-z^{a_n}}$. Bringing the left hand side to a common denominator, this denominator is going to be a polynomial which is nonzero on any primitive $a_n$-th root of unity, so if we multiply the equation with the $a_n$-th cyclotomic polynomial, the left hand side becomes $0$. But the right ...
Apr 4, 2011 at 18:55 history undeleted Burton Newman
Apr 4, 2011 at 18:53 history deleted Burton Newman
Apr 4, 2011 at 18:52 history answered Burton Newman CC BY-SA 2.5