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114
Example of a very simple math statement in old literature which is (verbatim) a pain to understand
math.stackexchange.com

72
Is being good at mathematic contests necessary to pursue a career in mathematics or physics?
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34
Can I recover a group by its homomorphisms?
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33
Encyclopedia of mathematics (?)
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28
Solving open problem with elementary method, is this publishable
academia.stackexchange.com

26
Why do we (mostly) restrict ourselves to Latin and Greek symbols?
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20
Finding a point with $f(x)=f'(x)$
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19
What does a "half derivative" mean?
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19
Is every noninvertible matrix a zero divisor?
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19
Can a 18 year old high school student publish a paper?
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18
How does Wiles' proof fail at $n=2$?
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18
Past open problems with sudden and easy-to-understand solutions
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16
Best Springer mathematics books
mathoverflow.net

16
Proof that a function is convex if and only if its epigraph is convex.
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16
Why do un-integrable functions exist?
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16
Proof of whitney's embedding theorem?
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15
Prove that there is a differentiable function $f: \mathbb{R} \to \mathbb{R}$ satisfying $[f(x)]^5+f(x)+x = 0$
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15
Why is/isn't the derivative of a differentiable function continuous?
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14
Is every commutative ring contained in a field?
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13
What is so special about Arnold's Trivium?
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12
What is the purpose of K-Theory?
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12
If I have a $0.00048\%$ chance of dying every second, how to numerically calculate the chance I have of dying in a day?
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11
How to prove that $ {\mathbf{GL}_{n}}(\mathbb{R}) $ is dense in $ {\mathbf{M}_{n}}(\mathbb{R}) $
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11
The integral $\int_0^\infty e^{-t^2}dt$
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10
What should I do if my advisor is forcing me to vote on a specific candidate in IEEE elections?
academia.stackexchange.com

10
Do people with average intelligence stand a chance making a tenure track math professorship at a research university?
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10
$\text{rank}(AB^2)=\text{rank}(AB)$
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10
Is $S^2\times S^2$ homeomorphic to $\mathbb{CP}^2\#\mathbb{CP}^2$?
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10
$G$ is torsion-free $[G:Z(G)]$ is finite $\implies$ $G$ is abelian ?
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10
Do there exist $n^2$ real coefficients such that all matrices in $\Bbb R^{n∗n}$ containing those coefficients are invertible?
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