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 Yearling
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Jul
29
comment Is this really a typo?
If a function $f$ is $C^k$ for $k\geq 1$ then it automatically is $C^1$, too. So the statement is valid.
Jul
4
comment Algebraic Solutions to Systems of Polynomial Equations
By 'all variables algebraic' you mean one solution will be a tuple of algebraic numbers?
Jun
28
comment An affine open neighborhood of a nonsingular point
No, it is not. In fact, it is a rich source of counterexamples regarding schemes that are not varieties.
Jun
27
comment An affine open neighborhood of a nonsingular point
Your $\Gamma(U,\mathcal{O}_X)$ is (by definition of finite type) a finitely generated $k$-algebra, not just a localization of one.
Jun
10
comment My sister absolutely refuses to learn math
I tend to agree with your last sentences but it is not at all clear to me whether quick learning later on is not actually also a function of having spent large amounts of time in school on the subject.
Jun
3
comment Theorems' names that don't credit the right people
Which is not at all wrong since the circumflex just denotes a left-out 's' from old French spelling.
May
22
awarded  Yearling
May
20
awarded  Constituent
May
7
awarded  Caucus
Jan
19
awarded  Informed
Dec
20
comment Find all polynomials that fix $\mathbb Q$ and the irrationals
For instance, $x^2$ will map $\sqrt{2}$ to $2$, and therefore be a counterexample.
Dec
19
comment Difference between a stalk of a sheaf and a fiber of a vector bundle
No need to be sorry. Next to each answer, under the arrows for up/downvoting, there is a little check mark. You can just click on the check mark belonging to the answer you like best to accept it. See here for some images explaining the process.
Dec
19
comment Difference between a stalk of a sheaf and a fiber of a vector bundle
Please consider accepting some answers to your previous questions. People will be less willing to respond if they think you won't appreciate their answers anyway.
Dec
16
comment Normality in a group $G$
Please supply some additional information, so that we can help you better. What have you done? Where are you stuck?
Dec
13
suggested rejected edit on Is $R = Q[x] / (x^4 - 3x^2+ 6x)$ isomorphic to a direct sum of two fields?
Dec
13
comment Is $R = Q[x] / (x^4 - 3x^2+ 6x)$ isomorphic to a direct sum of two fields?
We would appreciate it to see some thoughts of your own on this. Also, it is a bit rude to command us to prove it.
Dec
12
comment Let $G_1. …, G_k$ be any groups and $\sigma \in S_k$ a permutation. Prove the following map defines an isomorphism
Think about the inverse of the permutation.
Dec
11
answered Is the intersection of two quasi-compact open subsets of a scheme quasi-compact?
Dec
10
answered Find a normal extension over $\mathbb{Q}$ of degree 3
Dec
8
answered non-symmetric positive definite matrix!?