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Aug
19
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.
Aug
19
comment Simple example of non-arithmetic ring
Great answer, indeed. Also, thank you for the link to the other answer.
Aug
19
comment Simple example of non-arithmetic ring
Thank you for the example (simple and concrete).
Mar
14
comment How is $Ax + By = C$ the equation of a straight line?
Don't forget to consider the case $B=0$.
Mar
10
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.
Mar
10
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).