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Apr
16
awarded  Good Answer
Apr
16
awarded  Nice Answer
Mar
27
comment Prime ideals contained in the union of almost all prime ideals
Can you write down the sequence ?
Mar
27
comment The unit group of $\mathbb{Q}[x, y]/(x^2+y^2+1)$
@user26857 As a $\mathbb Q(i)$-algebra.
Mar
27
comment Difference between homotopy equivalence and homeomorphism - dimensionality
What do you mean by "On the other hand "difference in dimension" is still a nice way to tell apart homotopies from homeomorphisms."?
Mar
27
answered The unit group of $\mathbb{Q}[x, y]/(x^2+y^2+1)$
Mar
26
answered Proving that a holomorphic function is constant
Mar
26
answered Basis for proper rational functions
Mar
26
comment Why is $E[l]\cong\mathbb Z/l\mathbb Z\times\mathbb Z/l\mathbb Z$ for an elliptic curve $E$?
Do you know why it is true for an elliptic curve over the complex numbers?
Mar
25
comment Field extension of K with unique factorization?
I am curious to know whether one can show this without using class-field theory...
Mar
25
answered On a canonical morphism from Spec $O_{X,p} \rightarrow X$
Mar
25
comment Modular parametrization of elliptic curve
I believe that in your result, you need to assume that $f$ has rational coefficients.
Mar
25
comment Modular parametrization of elliptic curve
Hi Ferra, there is a problem in the above proof in the sense that $\mathbb C$ contains free $\mathbb Z$-modules of arbitrary rank, thus there is no reason a priori why the rank should be $\leq 2$. In fact, the fact that $f$ is an eigenform, which you have not used, is crucial; for a generic $f$, I would even think that the period mapping is injective on $H_1(X, \mathbb Z)$.
Mar
25
answered Curves on $\mathbb{A}^2$
Mar
21
awarded  Nice Answer
Mar
20
comment How to test if a given elliptic curve has complex multiplication
Do you want to check whether it has CM over $\mathbb Q$ or over $\overline{\mathbb{Q}}$?
Mar
17
awarded  Nice Answer
Mar
9
comment How do I prove that there infinitely many rows of Pascal's triangle with only odd numbers?
@Zubin This is Freshman's dream in prime characteristic
Feb
18
comment Do the maps need to be surjective in the definition of a profinite group?
Thanks for adding all of the details! I think the accepted answer should have gone to you. +1 from me anyways!
Feb
10
answered If $f$ has a pole, does $f^2$ has a pole?