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Apr
13
awarded  Good Answer
Apr
8
comment Roots of Unity: Sums, Products, and Field Extensions
@kevin Dear kevin, I added some more detail to my first hint.
Apr
8
revised Roots of Unity: Sums, Products, and Field Extensions
added 346 characters in body
Apr
8
awarded  Popular Question
Apr
8
answered Roots of Unity: Sums, Products, and Field Extensions
Apr
4
revised Let $t$ be a transcendental number. Prove that the set $\{(a+bt) \mid a,b \in \mathbb{Q}\}$ is not a number field.
edited title
Apr
4
answered Let $t$ be a transcendental number. Prove that the set $\{(a+bt) \mid a,b \in \mathbb{Q}\}$ is not a number field.
Mar
22
answered Prove that the Galois group of $x^n-1$ is abelian over the rationals
Mar
18
comment Calculating the divisors of the coordinate functions on an elliptic curve
Dear Alvaro, thank you so much for this very detailed and clearly explained answer. I really appreciate your help.
Mar
17
comment Calculating the divisors of the coordinate functions on an elliptic curve
Dear Alvaro, can you please explain why the function $\dfrac{X-e_1Z}{Z} = \dfrac{Y^2}{(X-e_2Z)(X-e_3Z)}$ has a double pole at $[0,1,0]$? I'm studying from Silverman's book and according to his definitions in page 18, I found a uniformizer at $[0,1,0]$ to be $x= \dfrac{X}{Y}$, but then it is not clear to me how to prove that the above rational function is in the ideal $M_{[0,1,0]}^{-2} = \langle x^{-2} \rangle_{K[E]_{[0,1,0]}}$
Mar
4
awarded  Popular Question
Feb
17
comment Equivalent definitions of Hermite polynomials
Dear @b00nheT, do you know a reference that someone whose only knowledge of physics amounts to what little he can remember from three General Physics courses taken in college about 8 years ago could understand? (I really hope that there's another way to pass from one definition to the other without having to solve the Schrodinger equation that you mention). Thanks a lot for your comment =)
Feb
17
asked Equivalent definitions of Hermite polynomials
Jan
20
revised Convergence of the integral $\int\limits_{1}^{\infty} \left( \frac{1}{\sqrt{x}} - \frac{1}{\sqrt{x+3}} \right) \, dx$
added 28 characters in body; edited tags; edited title
Jan
17
reviewed Reject suggested edit on A restatement of my question about the totient function and congruence classes
Jan
15
asked How to determine the group structure of $E(\mathbb{R})$ for an elliptic curve $E/\mathbb{R}$
Jan
8
revised How to show that $\Delta\left(\frac{az+b}{cz+d}\right)=(cz+d)^{12}\Delta(z)$?
added 29 characters in body
Dec
31
reviewed Approve suggested edit on How many even numbers are there in a set $\{x_1, x_2 … x_n\}$
Dec
30
answered Entire function with $|f(z^{2})|\leq e^{|z|}$
Dec
28
reviewed Reject suggested edit on Prove that a linear operator is indecomposable