Jeff
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 Oct 2 comment Why learning modern algebraic geometry is so complicated? I feel compelled to link to this post on MO regarding the usefulness of studying EGA: mathoverflow.net/questions/3041/… Oct 2 answered Why can Echelon Matrices have zero rows but Echelon systems can't have any equations with no leading variables? Sep 29 answered Visualising finite fields Sep 14 suggested rejected edit on Demonstração do Teorema de Bezout. (Proof of Bézout's Theorem) Sep 13 answered Ramification index in number fields extension Aug 23 awarded Necromancer Aug 14 answered How the ring of algebraic numbers looks like? Jul 28 answered How can a function's range be 'the reals including infinity' Jun 28 comment Are $\mathbb{C} \otimes _\mathbb{R} \mathbb{C}$ and $\mathbb{C} \otimes _\mathbb{C} \mathbb{C}$ isomorphic as $\mathbb{R}$-vector spaces? $\mathbb{C} \otimes _\mathbb{C} \mathbb{C} \simeq \mathbb{C}$ Jun 16 comment A subset of a field that is a subfield This is definitely what the problem-writer had in mind. Jun 11 comment '$R$-rational points,' where $R$ is an arbitrary ring Yes, but that edit button is so far away... Jun 11 comment '$R$-rational points,' where $R$ is an arbitrary ring We seem to have posted at the same time, but I like your answer better =D Jun 11 answered '$R$-rational points,' where $R$ is an arbitrary ring May 17 revised Details about a Recurrence Relation problem. Fixed exponents. May 17 suggested approved edit on Details about a Recurrence Relation problem. May 16 awarded Caucus May 16 answered Prime decomposition in ring extensions May 13 awarded Suffrage May 12 awarded Yearling Apr 9 awarded Civic Duty