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Feng
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How to study math?

Don't just read it; fight it!

-------Paul Halmos

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11
If $L^1$ average of $f$ is smaller than $t^2$ then $f=0$ a.e.
10
Given a sequence with $a_1=1$ and $a_{n+1}=a_n-\frac13a_n^2$. Is there an easier way to get an upper bound of $1/a_{100}$?
8
Does $H\leq G$ imply $[G_x: H_x]\leq [G: H]$?
8
Little-o notation: limit in the definition
8
Find the interval of convergence of $\sum \frac{x^{2k+1}}{3^{k-1}}$

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