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9h
comment How many Gaussian Integers $z$ divide 10
Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level.
10h
comment On the expression of the Galois conjugates in terms of the coordinates in a basis
@Stabilo My pleasure
10h
answered On the expression of the Galois conjugates in terms of the coordinates in a basis
12h
comment How do I compute the norm of a non-principal ideal of the ring of integers of a quadratic field without using ''large'' results
The bar denotes the nontrivial automorphism of $\mathbb Q(\sqrt{15})$, sending $\sqrt{15}$ to $-\sqrt{15}$; it is not complex conjugation.
12h
comment How do I compute the norm of a non-principal ideal of the ring of integers of a quadratic field without using ''large'' results
What makes you think that $I^2$ should be a priori principal? $I^2$ and $I\overline{I}$ are not the same ideal...
May
19
answered Number field attached to a finite group.
May
19
answered What is the motivation for complex conjugation?
May
19
comment Questions on integer-valued polynomials
Beautiful answer! Merci Clément!
May
19
accepted Questions on integer-valued polynomials
May
19
revised Questions on integer-valued polynomials
added 204 characters in body; edited title
May
19
comment Questions on integer-valued polynomials
@baharampuri I'm not so sure I understand what you are saying. I'll believe that the conjecture is false only if you can come up with an explicit counter-example. ;) I've checked for lots of values of (m,n) and it seems to be true.
May
19
comment Questions on integer-valued polynomials
@baharampuri Thanks for your comment. Yes, as you noticed, the expansion of ${x \choose n}{x \choose m}$ does go up to ${x \choose n+m}$, for reasons of degree. For more reading, you could start with this wikipedia page. Regards,
May
19
asked Questions on integer-valued polynomials
May
18
awarded  Enlightened
May
17
answered Finding $\mathbb Z[\zeta_p]^∗$, the group of units of $\mathbb Q(\zeta_p$)
May
17
awarded  sequences-and-series
May
16
revised Poles of a sum of functions
edited title
May
16
answered Poles of a sum of functions
May
16
answered Prove that if $G$ is a finite group and $H$ is a proper normal subgroup of largest order, then $G/H$ is simple.
May
16
comment Interpretation of a short exact sequence from elliptic curves in terms of torsors
@user239991 That's a very good (and deep) question! Have you looked at the definition of the Selmer group?