Gregor Bruns
Reputation
1,324
Next privilege 2,000 Rep.
 Jul4 comment Algebraic Solutions to Systems of Polynomial Equations By 'all variables algebraic' you mean one solution will be a tuple of algebraic numbers? Jun28 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. Jun27 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. Jun10 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. Jun3 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. May22 awarded Yearling May20 awarded Constituent May7 awarded Caucus Jan19 awarded Informed Dec20 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. Dec19 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. Dec19 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. Dec16 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? Dec13 suggested rejected edit on Is $R = Q[x] / (x^4 - 3x^2+ 6x)$ isomorphic to a direct sum of two fields? Dec13 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. Dec12 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. Dec11 answered Is the intersection of two quasi-compact open subsets of a scheme quasi-compact? Dec10 answered Find a normal extension over $\mathbb{Q}$ of degree 3 Dec8 answered non-symmetric positive definite matrix!? Dec5 comment Is it true that if a graph is n-regular that it must have n+1 vertices? I interpreted that as 'exactly', but you're right, maybe it was meant as 'at least'. Curiously, I didn't consider this, even if I used to draw two cards when someone told me to "Draw one card".