3,680 reputation
831
bio website nullteilerfrei.de
location Germany
age 29
visits member for 3 years, 2 months
seen 1 hour ago

I'm a PhD student with research interests in Algebraic Geometry, Algebraic Complexity Theory and Geometric Invariant Theory.


Apr
4
answered Homogeneous forms of degree $d$ in quotient ring
Apr
3
answered The continuity of the rational maps in the zariski topology
Apr
3
awarded  Custodian
Apr
3
reviewed Approve suggested edit on The continuity of the rational maps in the zariski topology
Apr
3
revised Geometric meaning of completion and localization
added 481 characters in body
Apr
3
answered Geometric meaning of completion and localization
Mar
29
revised Non-commutative or commutative ring or subring with $x^2 = 0$
added 201 characters in body
Mar
28
comment Non-commutative or commutative ring or subring with $x^2 = 0$
@Berci: Whoops, I misread that.
Mar
28
answered Non-commutative or commutative ring or subring with $x^2 = 0$
Mar
26
comment Number of points in the fibre and the degree of field extension
This leaves open one question: How do you define the degree of $\phi$?
Mar
26
comment Number of points in the fibre and the degree of field extension
You only get a morphism $K(Y)\to K(X)$ if $\pi$ is also dominant. If it is dominant and injective, it identifies $X$ with some dense subset of $Y$, and they therefore share an open affine. How do you define finite morphism? That'd be good to know in order to answer your second question.
Mar
23
comment Abstract nonsense proof of snake lemma
@Martin Brandenburg: +1 and thanks a lot, that looks great. I am still curious if anyone can explain the reasoning in Borceux' book, though.
Mar
10
comment How to show $\phi(X)$ contains a non-empty open set of its closure $\overline{\phi(X)}$?
Not an answer at all, but this is Proposition 15.4.2 in the sweet book Lie Algebras and algebraic groups by Patrice Tauvel and Rupert Yu.
Mar
8
comment Do “multiples” of open dense sets of an algebraic group union to the whole group?
@DylanWilson: +1 and also, your comment is really the answer. I'd +1 that as an answer. Why don't you make it an answer. =D
Mar
7
answered Time complexity of a modulo operation
Mar
7
revised Time complexity of a modulo operation
added 7 characters in body
Mar
7
answered The use of master theorem appriopriately
Mar
7
revised The use of master theorem appriopriately
LaTeX
Mar
5
comment Computing the trace of a linear map, expressed in terms of a generating set which is not a basis
I should have said $O(n)$ many operations.
Mar
5
revised Computing the trace of a linear map, expressed in terms of a generating set which is not a basis
deleted 12 characters in body