Martin Brandenburg

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569 Answers

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63	Nice examples of groups which are not obviously groups
44	If $AB = I$ then $BA = I$
24	Why does the set of all singleton sets not exist?
23	Show that $\sqrt[3]{2+\frac {10} 9\sqrt 3}+\sqrt[3]{2-\frac {10} 9\sqrt 3}=2$
21	Proving that $\mathbb{Z}[x]$ and $\mathbb{Q}[x]$ are not isomorphic.

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22,220 Reputation

+10	On the definition of the structure sheaf attached to $Spec A$
+10	example of a flat but not faithfully flat ring extension
+10	What does a proof in an internal logic actually look like?
+10	Proving that $\mathbb{Z}[x]$ and $\mathbb{Q}[x]$ are not isomorphic.

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104 Questions

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23	The category of compact metric spaces
21	A short proof for $\dim(R[T])=\dim(R)+1$?
21	Ideals of $\mathbb{Z}[X]$
19	An interesting topological space with $4$ elements
19	Perturbation trick in the proof of Seifert-van-Kampen

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162 Tags

572 abstract-algebra × 238	148 group-theory × 52
337 commutative-algebra × 158	112 linear-algebra × 30
311 algebraic-geometry × 132	76 modules × 37
311 category-theory × 123	76 field-theory × 24
229 ring-theory × 87	66 homological-algebra × 21

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1 Account

$Mathematics Stack Exchange$

Mathematics

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36 Badges

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Nice Answer × 14	group-theory
Revival × 6	abstract-algebra
Good Answer × 2	Citizen Patrol
Nice Question × 11	ring-theory
linear-algebra	Enlightened × 2

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740 Votes Cast

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