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I'm a graduate student of mathematics in Germany.


29m
revised Pumping lemma contradiction
tex formatting
31m
comment Pumping lemma contradiction
How about $b^pa^{p+1}$ instead?
3h
revised Ring Properties
added 17 characters in body
3h
answered Ring Properties
Apr
19
comment Algebra, Geometry and Algebraic Geometry
My understanding (probably naïve): Algebra deals with structures and equations, geometry deals with spaces and figures and algebraic geometry combines structures with spaces and equations with figures.
Apr
19
comment Lattice Definition
You should probably also ask for the origins of both notions and add the math-history-tag.
Apr
18
revised Classical geometry statement in modern terminology
added 192 characters in body
Apr
18
revised Classical geometry statement in modern terminology
added 192 characters in body
Apr
18
answered Classical geometry statement in modern terminology
Apr
14
comment compact open set?
Every compacet set in a metric space (or more generally a Hausdorff space) is closed in it. You certainly implied this, but I think it’s worth stating it explicitly.
Apr
13
comment Simply Connected Points in Disk
Do you mean $S^1$?
Apr
13
comment What exactly is a transformation matrix with respect to a basis?
Anyway, regarding your actual question: To me as well, the transformation matrix of $T$ (with respect to the bases $v_1, … , v_m$ of $V$ and $w_1, …, w_n$ of $W$) is the matrix $(a_{k,i})_{k,i}$. I don’t know what the person who told you it’s not was thinking of. So this is a non-answer, but if everyone else feels the same, no answer will ever be given.
Apr
13
comment What exactly is a transformation matrix with respect to a basis?
No, I don’t think it’s a problem, it should be fine. I was just wondering. (I saw your name popping up once or twice in the last few months before, so I was a bit startled by the fact that this name should belong to a new user with only one reputation point.)
Apr
13
comment What exactly is a transformation matrix with respect to a basis?
May I ask you something personal? Are this and this and this and this and possibly twenty-seven other such users all you? Do you maybe want to merge all these accounts?
Apr
11
comment Is the length of the composition series of a free module identical to the number of its bases?
Thank you. I have the same issue (and therefore the same wording).
Apr
11
comment Is the length of the composition series of a free module identical to the number of its bases?
Can you tell me on which page you have found this? And can you tell me which version of Commutative Algebra you have? So I can look up to see if I have the same wording.
Apr
11
comment Is the length of the composition series of a free module identical to the number of its bases?
Okay, it seems to me that you are right. For $λ(M) = l(M)/l(A)$ it’ll work, though, wouldn’t it?
Apr
11
comment Is the length of the composition series of a free module identical to the number of its bases?
What are the $A_n$?
Apr
11
revised Finding the CFG (Context Free Grammar) of a language
edited body
Apr
11
comment Finding the CFG (Context Free Grammar) of a language
@danishjo It’s a trivial statement, of course, but it should help you thinking about the variables you have to introduce and which rules to apply to them. Did you already try to construct a grammar?