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Top Questions
26
votes
How many connected components does $\mathrm{GL}_n(\mathbb R)$ have?
general-topology
matrices
lie-groups
asked Jan 21 '12 at 12:18
math.stackexchange.com
20
votes
About translating subsets of $\Bbb R^2.$
geometry
group-theory
set-theory
asked Feb 20 at 23:23
math.stackexchange.com
17
votes
Are these exactly the abelian groups?
group-theory
abelian-groups
asked Feb 14 at 17:46
math.stackexchange.com
15
votes
Intuition for $\omega^\omega$
set-theory
intuition
exponentiation
ordinals
asked Mar 20 at 23:26
math.stackexchange.com
14
votes
Is this an equivalent definition of a normal subgroup?
group-theory
definition
asked Apr 13 at 15:48
math.stackexchange.com
12
votes
Proving identities like $\sum_{k=1}^nk{n\choose k}^2=n{2n-1\choose n}$ combinatorially
homework
combinatorics
proof-strategy
binomial-coefficients
problem-solving
asked Feb 24 at 14:15
math.stackexchange.com
10
votes
Is the standard structure of a topological vector space on reals unique?
topological-vector-spaces
asked Jan 21 '12 at 12:04
math.stackexchange.com
10
votes
Can the real and imaginary parts of $\dfrac{\sin z}z$ be simplified?
complex-analysis
trigonometry
hyperbolic-functions
asked Nov 28 '12 at 21:54
math.stackexchange.com
10
votes
Why is $x^3-5x$ injective on the rationals?
number-theory
polynomials
rational-numbers
asked Mar 4 at 20:18
math.stackexchange.com
7
votes
What is the easiest way to integrate $\left(\frac{1-x}{1+x}\right)^{1/2}?$
integral
asked Nov 27 '12 at 19:04
math.stackexchange.com
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