Gonzalo Medina
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 May13 awarded Caucus Oct25 awarded Nice Question Aug19 awarded Scholar Aug19 accepted Simple example of non-arithmetic ring Aug19 comment Simple example of non-arithmetic ring Thanks for your answer and for the link. I'll go with Bill's answer since it gives a simple mechanism to find non-arithmetic rings. Aug19 comment Simple example of non-arithmetic ring Great answer, indeed. Also, thank you for the link to the other answer. Aug19 comment Simple example of non-arithmetic ring Thank you for the example (simple and concrete). Aug18 awarded Student Aug18 asked Simple example of non-arithmetic ring Mar14 comment How is $Ax + By = C$ the equation of a straight line? Don't forget to consider the case $B=0$. Mar14 answered How is $Ax + By = C$ the equation of a straight line? Mar14 awarded Editor Mar14 revised The first Noether isomorphism theorem added descripton of commutative diagram Mar14 answered The first Noether isomorphism theorem Mar10 awarded Teacher Mar10 awarded Supporter Mar10 comment Regarding a proof involving geometric series @Qiaochu: in that we agree. If someone has problems understanding that 0.9999...=1 then the problem comes from not understanding the notions of convergence of a series and basic facts about real numbers. Mar10 answered Which of the following polynomials are subspaces of $\mathbb{P}_n$ for an appropriate value of n? Mar10 comment Regarding a proof involving geometric series @Qiaochu: but both 1) and 2) are fairly easy to prove and both are among the simpler facts (proved almost immediately after the definition) about series. I see no problem in assuming both facts as known (understanding "known" as very easy to prove if need be). Mar10 answered Question about indices of subgroups