User Christophe Leuridan - MathOverflow Meta

Christophe Leuridan

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17

Can nonnegative functions $f(x,y,z)$ be written as a product of pairwise functions $u(x,y) v(y,z) w(x, z)$?

11

If Series $\sum \sqrt\frac{a_n}{n}$ converges then $\sum a_n$ converges?

10

Solving a limit about sum of series

9

Sophomore's Eternal Dream $\int_0^1\cdots\int_0^1 (t_1t_2\cdots t_n)^{t_1t_2\cdots t_n} dt_1 dt_2\cdots dt_n$

9

Conjecture: If matrix $M$ has entries (left to right, then top to botom) $\sin 1,\sin 2,\sin 3,\dots,\sin (n^2)$, where $n\ge 3$, then $\det M = 0$.