Jeff
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 Feb 11 comment Finitely generated algebra as a module over a subalgebra Two polynomials (in $f_3$) are equal if and only if all of their coefficients are equal, so this is immediate. Feb 10 answered Finitely generated algebra as a module over a subalgebra Feb 10 comment The mod $p$ Galois representation of the Frey curve is unramified away from $2, p$ This is an excellent answer. Feb 9 comment The mod $p$ Galois representation of the Frey curve is unramified away from $2, p$ The one-line "intuitive" answer to your question is that the primes dividing the discriminant are those for which the curve has bad reduction, i.e. reducing modulo those primes yields a singular curve over a finite field, so we expect bad things to happen at such primes. Where the curve is smooth, we expect everything to be nicely behaved. Feb 9 revised The mod $p$ Galois representation of the Frey curve is unramified away from $2, p$ Wrote ramified when I meant unramified Feb 9 answered The mod $p$ Galois representation of the Frey curve is unramified away from $2, p$ Jan 27 awarded Good Answer Dec 15 awarded Caucus Oct 25 awarded Organizer Oct 25 revised Proving property of congruence - help needed This has nothing to do with modular forms. Oct 25 suggested approved edit on Proving property of congruence - help needed Oct 24 answered Value in retracing mathematicians' steps (specifically Galois)? Oct 6 comment Finding the area of an ellipse using linear algebra I guess it's impractical for me to hope to police this entire site, so never mind. I have external ways to deal with this situation. Oct 6 comment Finding the area of an ellipse using linear algebra Yes, I'm ok with hints, and I like yours. What I'm concerned about are full solutions. Oct 6 comment Finding the area of an ellipse using linear algebra Also, the user has already asked another question which was completely answered for him/her. Clarifications are one thing (and easily obtained my emailing me). Solutions are a different matter. Oct 6 comment Finding the area of an ellipse using linear algebra @dleggas While I take your point, this particular assignment is technically a take-home quiz. Certainly you agree that questions from take-home quizzes and exams should not be answered on this website? Oct 6 comment Finding the area of an ellipse using linear algebra This is an assignment which I have given as homework. Please do not answer this. My students should come to me for help. Sep 1 revised Computing the integral $\int \frac{u}{b - au - u^2}\mathrm{d}u$ fixed latex for integral sign, cleaned up Sep 1 suggested approved edit on Computing the integral $\int \frac{u}{b - au - u^2}\mathrm{d}u$ Jun 26 comment Can a ring without a unit element have a subring with a unit element? www-math.mit.edu/~poonen/papers/ring.pdf