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Top Questions
16
votes
Examples of properties that hold almost everywhere, but that explicit examples unknown.
measure-theory
big-list
asked May 17 at 16:32
math.stackexchange.com
15
votes
Help deriving that $\mathrm{sign} : S_n\to \{\pm 1\}$ is multiplicative
group-theory
permutations
determinant
symmetric-groups
multilinear-algebra
asked Nov 8 '11 at 0:52
math.stackexchange.com
12
votes
Why can't there be a monotone function with domain $\mathbb{R}$ and range $\mathbb{R} \setminus \mathbb{Q}$?
real-analysis
asked Oct 26 '11 at 0:57
math.stackexchange.com
10
votes
Image of closed ball under degenerate integral operator is a closed set
real-analysis
functional-analysis
integral-transforms
asked Nov 22 '11 at 22:00
math.stackexchange.com
10
votes
Compact = Closed + Bounded + (?)
real-analysis
soft-question
asked Nov 25 '11 at 18:41
math.stackexchange.com
9
votes
Determinant of a specific circulant matrix, $A_n$
linear-algebra
matrices
determinant
asked Nov 11 '11 at 2:47
math.stackexchange.com
9
votes
Galois Group of $(x^3-5)(x^2-3)$
abstract-algebra
field-theory
galois-theory
asked May 11 '12 at 4:56
math.stackexchange.com
8
votes
Help remembering a Putnam Problem
functional-equations
contest-math
asked Nov 10 '11 at 20:19
math.stackexchange.com
8
votes
Intermediate field between $F$ and $F(x)$
homework
abstract-algebra
field-theory
asked Nov 16 '11 at 18:33
math.stackexchange.com
7
votes
How to show convolution of an $L^p$ function and a Schwartz function is a Schwartz function
homework
measure-theory
harmonic-analysis
convolution
lp-spaces
asked Nov 17 '12 at 3:30
math.stackexchange.com
1
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Top Answers
13
integration of a continuous function $f(x) $ and $xf(x)$ is zero
math.stackexchange.com
10
How to prove $I + t X$ is invertiable for small enough $ | t | ?$
math.stackexchange.com
8
prove that the set of rational numbers is not connected on the real line
math.stackexchange.com
8
Calculate: $\lim_{n\to\infty} \int_{0}^{\pi/2}\frac{1}{1+x\tan^{n} x }dx$
math.stackexchange.com
7
Who introduced the notation $x^2$?
math.stackexchange.com
7
Continuous function from $[0,1]$ to $[0,1]$ whose fibers are infinite
math.stackexchange.com
7
some doubts about differential equations
math.stackexchange.com
6
Additive inverse of a nilpotent element is nilpotent
math.stackexchange.com
6
A system of equations with 5 variables
math.stackexchange.com
6
Let $\sum _{n=1}^{\infty} a_{n} $and $\sum _{n=1}^{\infty} b_{n} $ converge absolutely. Prove that …
math.stackexchange.com
6
How to create PDF of slides with audio?
academia.stackexchange.com
5
Prove that the open interval $(0, 1)$ contains uncountably infinite numbers.
math.stackexchange.com
5
Example of a function $f:\mathbb{R}^2\to\mathbb{R}$ not differentiable at $(0,0)$, but has a directional derivative at $(0,0)$ in all directions
math.stackexchange.com
5
Solution to a system of quadratics
math.stackexchange.com
5
Countable set having uncountably many infinite subsets
math.stackexchange.com
5
Your favourite application of the Baire category theorem
math.stackexchange.com
5
Appropriate Notation: $\equiv$ versus $:=$
math.stackexchange.com
4
How to show that if $P(A_{i}) = 1$ for all $i \geq 1$ then $P(\ \bigcap_{i=1}^{\infty}A_i)=1$
math.stackexchange.com
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