Fredrik Meyer
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 1d comment Blow-up toric varieties. Cox has also written a rather short and easy-read article (much shorter than the book). It can be found on his web page: www3.amherst.edu/~dacox Apr14 answered How can I verify that the ideal $(x^2-zw, z^2-yw, y^3-xw, w^3-xy^2z)$ in $\mathbb Q[x,y,z,w]$ Mar28 answered Lines on a singular cubic surface Mar28 comment Definition of a smooth complete integral pointed algebraic curve This sounds like material you can read from Hartshorne's book. Mar27 comment Succesive vs simultaneous blow-up This is not a particularly helpful answer. Can you give some reasons why your answer is true? Mar25 comment If $\phi :G\rightarrow H$ is a group homomorphism and $G$ is soluble, then $Im(\phi)$ is also soluble @AndrewBrick Try applying $\phi$ to each part of the series. Mar24 answered If $\phi :G\rightarrow H$ is a group homomorphism and $G$ is soluble, then $Im(\phi)$ is also soluble Mar20 revised Suppose nine distinct points in $\mathbb P^2(\Bbb C )$ do not all lie on any one line and any line through two of them passes through a third. Show… added 1 character in body; edited title Mar8 comment What is $I(\{(0,0)\})$? @Leafar No, $\langle x,y\rangle$ is equal to all polynomial combinations of $x$ and $y$. Mar8 comment In a PID , show that a maximal ideal is a prime ideal and conversely. What is the question? Mar7 revised Non-isomorphic $\mathbb{C}$-algebras added 11 characters in body Mar6 comment How to show that the intersection of all neighbourhood of $0$ in a topological group is a subgroup? I asked this question before. See here: math.stackexchange.com/questions/13368/… Mar6 answered Computing the ideal of a finite set of points Mar5 comment Finding a specific module. @user26857 Just to be sure! This is the way one shows that the rank of free modules over a commutative ring is well-defined anyways. Mar5 answered Finding a specific module. Mar4 comment Describe the differential of $d\phi : \mathbb{T}_{t, \mathbb{A^1}} \rightarrow \mathbb{T}_{t^3, t^4, t^5, W}$ @George Try Shafarevich.' Mar3 answered Line Bundles on Local Rings Mar2 answered scheme of finite type - geometric interpretation Mar1 answered From a family of projective curves to a surface Feb28 comment Identifying the tensor product of two given modules over $\mathbb Z/2\mathbb Z$. Over what ring is the tensor product taken?