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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