Jesko Hüttenhain

3,303 reputation

223

bio	website	nullteilerfrei.de
	location	Germany
	age	28
visits	member for	1 year, 11 months
	seen	2 hours ago
stats	profile views	389

I'm a PhD student with research interests in Algebraic Geometry, Algebraic Complexity Theory and Computer Algebra, i.e. doing delicate algebra to come up with powerful algorithms.

	3,303 reputation	bio	website	nullteilerfrei.de	visits	member for	1 year, 11 months
223 badges		location	Germany		seen	2 hours ago

summary answers questions tags badges favorites bounties reputation activity

417 Actions

suggestions reviews revisions comments badges posts accepts all

Dec 28	comment	How to find the number of homomorphisms of $\mathbb{Z}$ into $\mathbb{Z}$? You guys were right of course. Sorry for the confusion there. Fixed it.
Dec 28	revised	How to find the number of homomorphisms of $\mathbb{Z}$ into $\mathbb{Z}$? deleted 11 characters in body
Dec 28	answered	How to find the number of homomorphisms of $\mathbb{Z}$ into $\mathbb{Z}$?
Dec 16	answered	Algebra: Orthogonal Complement
Dec 15	comment	How many solutions are there to the equation $x + y + z + w = 17$? that's beautiful.
Dec 15	revised	How many solutions are there to the equation $x + y + z + w = 17$? beautified
Dec 15	answered	How many solutions are there to the equation $x + y + z + w = 17$?
Dec 13	comment	How to calculate the maximum flow in this graph by the Edmonds-Karp algorithm? Oh and yea, the value of the maximum flow is 8.
Dec 12	comment	Complex Numbers Question @Some1: The point to my statement is that $f$ has real coefficients, but the second polynomial does not satisfy this condition. See I.J.Kennedy's answer.
Dec 12	comment	How to calculate the maximum flow in this graph by the Edmonds-Karp algorithm? I am not sure I understand your question. Do you know what a residual graph is?
Dec 12	answered	Solving Linear Equation in One Unknown
Dec 12	answered	Complex Numbers Question
Dec 12	answered	How to calculate the maximum flow in this graph by the Edmonds-Karp algorithm?
Dec 12	awarded	Analytical
Dec 12	comment	What does it mean to say a polynomial has an isolated singularity Let $R=k[x_1,\ldots,x_n]/f$ be the coordinate ring of $H=Z(f)$. The partial derivatives $g_i := \partial f/\partial x_i \in R$ are a minimal set of generators for the ideal of the isolated singularity. This follows because the maximal ideal of a singular point can not be generated by $n-1=\dim(H)$ elements, but it is generated by the $n$ elements $g_i$.
Dec 12	answered	closed subschemes of projective space over a scheme
Dec 2	answered	Euler characteristic in pullbacks
Dec 2	comment	Can the completion of a non-domain be a domain Your proof is completely correct. Just for fun and because it seems related, Theorem 7.9 from Eisenbud says that if $R$ is a local ring with maximal ideal $m$ that is a localization of a ring finitely generated over a field or $\mathbb{Z}$, then $\hat{R}$ has no nilpotent elements.
Dec 2	answered	How is this problem called?
Nov 5	comment	Natural space to consider solution to polynomial equations $\mathbb{CP}^2$ has nice geometric properties: For instance, two lines always intersect in a point. In $\mathbb{C}^2$, you can have parallel lines that do not satisfy this condition.