Mathematics
Martin Brandenburg's user avatar
Martin Brandenburg's user avatar
Martin Brandenburg's user avatar
Martin Brandenburg
  • Member for 13 years, 3 months
  • Last seen this week
  • Berlin, Germany
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About

I'm doing software development now, which is why my activity on mathoverflow and mathematics has become quite irregular. So probably I won't see your questions on my old answers, sorry for that.

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All Questions Answers
Score Newest
question
821
A proof of $\dim(R[T])=\dim(R)+1$ without prime ideals?
Apr 11, 2013
answer
174
Nice examples of groups which are not obviously groups
Apr 15, 2013
answer
152
If $AB = I$ then $BA = I$
Sep 2, 2010
question
109
Ring structure on the Galois group of a finite field
Nov 17, 2013
answer
77
Order of a product of subgroups. Prove that $o(HK) = \frac{o(H)o(K)}{o(H \cap K)}$.
Jul 10, 2012
question
70
Geometric intuition for the tensor product of vector spaces
Sep 6, 2013
answer
62
A non-noetherian ring with noetherian spectrum
Oct 21, 2010
question
60
Surprisingly elementary and direct proofs
May 28, 2013
question
59
Is Stokes' Theorem natural in the sense of category theory?
Apr 8, 2015
answer
58
Submodule of free module over a p.i.d. is free even when the module is not finitely generated?
Jun 25, 2012
Top Meta posts
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5
Dealing with answers in comments.
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291
Examples of common false beliefs in mathematics
106
A proof of $\dim(R[T])=\dim(R)+1$ without prime ideals?
92
$A$ is isomorphic to $A \oplus \mathbb{Z}^2$, but not to $A \oplus \mathbb{Z}$
88
When is $A$ isomorphic to $A^3$?
77
Rigidity of the category of schemes

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