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Mathematics
Allium tuberosum's user avatar
Allium tuberosum's user avatar
Allium tuberosum's user avatar
Allium tuberosum
  • Member for 32 days
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7
Show that $e^{-n}\sum_{i=0}^n \frac{n^i}{i!} > \frac{1}{2}$ for all positive integers $n$ (with limit exactly $1/2$ as $n\to\infty$)
Apr 8
5
Angle-chasing proof that the sum of angles in a hyperbolic triangle is always less than $\pi$?
Apr 25
5
Is it true that if $P(x)$ is a square number for every integer, then $P(x)=(Q(x))^2$
yesterday
4
Is the map $\Phi: E \otimes_F E \to E^m$ always surjective?
Apr 28
4
If a tetrahedron has a midsphere, then $\rho^2$ is shown to be rational in the vertex coordinates; must $\rho$ itself be rational too?
2 days ago
4
Is the map $\Phi: E \otimes_F E \to E^m$ always surjective?
Apr 28
3
Is $f(t)=\frac{\sin(tp)\sin(tq)}{\sin(tr)\sin(ts)}$ monotone on the interval $(0,\frac{\pi}{s})$?
Apr 19
2
Count conics of a given eccentricity tangent to a complete quadrilateral: is it true that for every $c\ge\sqrt2$ there are at most two?
Apr 11
2
Image of $F(x,y)=(xe^{-y},\,ye^{-x})$ on $(0,\infty)^2$ given by inequalities and asking about the converse
Apr 14
2
Pathwise formula for a vector potential from a divergence-free field
Apr 21