Top network posts

• 9 supremum of $\int |\int f(x)-f(y)\,dy| \,dx $.
• 7 Is there limit $ \lim_{(x,y) \to (0,0)} \frac{x^3}{x^2 + y^2}$?
• 6 If $(\nabla f(x)-\nabla f(y))\cdot(x-y)\geq m(x-y)\cdot(x-y)$, why is $f$ convex?
• 5 Proving $\sum_{n \geq 1} \frac{a_n}{1+ a_n}$ diverges provided $\sum a_n$ diverges and $(a_n)$ is decreasing and nonegative
• 5 Prove $n^2 > (n+1)$ for all integers $n \geq 2$
• 5 Prove $\frac {1}{\cos 0^\circ \cdot \cos 1^\circ} + \ldots +\frac {1}{\cos 88^\circ \cdot \cos 89^\circ}= \frac{\cos 1^\circ}{\sin 1^\circ}$
• 5 A difficulty solving a limit
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