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user165013
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I'm a college student in Jilin University,Changchun,China.I'm interested in MATH,CHESS,LATEX.

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6
Double series problems
Feb 2, 2017
answer
2
Explicit formula for the j-invariant of binary quartic form
May 3
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27
An integration of product $(1-x^n)$
16
How to proof the following function is always constant which satisfies $f\left( x \right) + a\int_{x - 1}^x {f\left( t \right)\,dt} $?
16
Calculate $\int_0^\infty {\frac{x}{{\left( {x + 1} \right)\sqrt {4{x^4} + 8{x^3} + 12{x^2} + 8x + 1} }}dx}$
15
Inequality of numerical integration $\int _0^\infty x^{-x}\,dx$.
14
A difficult contest question from the former Soviet Union