SL2

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56 Answers

newest activity votes
34
Multiplying by a $1\times 1$ matrix?
13
Infinite cyclic group generated by every single element?
13
Eigenvector of magic square
8
Equivalent definition of exactness of functor?
8
Is there a “most random” state in Rubik's cube?
8
Product and Box Topologies
7
($\mathbb Q$,+) and $\mathbf{Z}_{p^\infty}$ has this property?
7
lim of $\frac{1}{n} \mathbb{Z}$
6
Nilpotent matrix question
6
How to show path-connectedness
6
Finding a simplicial complex with a special homological feature
5
Cokernels - how to explain or get a good intuition of what they are or might be
5
From Presheaf to Sheaf
5
Prove the map is null homotopy
5
Showing there exist no retractions $r: X \to A$ for given $X,A$
5
What is the fundamental group of $\mathbb{CP}^1$ minus a finite set of points?
5
Original source for a quote by Lobachevsky
5
Integrating $\int \frac{1}{1+e^x} dx$
4
$\mathbb{Z}$ has no torsion?
4
Proving that $\mathbb{Z}[\sqrt{2}]$ is a Euclidean domain
4
The A^1-localization in the unstable motivic category
4
Exponential objects in a cartesian closed category: $a^1 \cong a$
4
Good book on homology
4
Proof that the irrational numbers are uncountable
4
When is $[0,1]^K$ submetrizable or even metrizable?
4
Singular homology of spaces with trivial topology
3
Showing a homomorphism of a field algebraic over $\mathbb{Q}$ to itself is an isomorphism.
3
How to interpret $1 \to 0$ in ${\bf Set}^\mathrm{op}$, and ${\bf Set}^\mathrm{op}$ itself?
3
abstract algebra question concerning groups
3
Prime ideals in coordinate rings
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