Ziqian Xie
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### Questions (28)

 10 How to evaluate this integral $\int_{-\infty}^{+\infty}\frac{x^2e^x}{(1+e^x)^2}dx$? 5 What is the geometric interpretation of the Koszul formula? 5 How to calculate $|\operatorname {SL}_2(\mathbb Z/N\mathbb Z)|$? 4 A combinatorial problem about number partition 4 How to compute $\int_0^{\infty}\sqrt x \exp\left(-x-\frac{1}{x}\right) \, dx$?

### Reputation (523)

 +10 Question about parallel displacement on a surface +10 Explain the diference between your solution of the system Ax = b and the MATLAB's solution. +25 What is the geometric interpretation of the Koszul formula? +5 Prove that on a compact manifold, Laplacian can not take constant value

 1 Explain the diference between your solution of the system Ax = b and the MATLAB's solution. 1 Show that $abc=[ab,bc,ca]*(a,b,c)=(ab,bc,ca)*[a,b,c]$ 1 How to prove $g(z) = \frac {a \bar z + b } {c \bar z + d}$ is a bijective mapping of UHP to UHP? 1 Question about weight 2 Eisenstein series 1 Simplification of different base logarithms

### Tags (56)

 2 number-theory × 3 1 proof-strategy 1 complex-analysis × 6 1 rational-numbers 1 modular-forms × 3 1 logarithms 1 matrices × 2 1 equivalence-relations 1 abstract-algebra 1 discrete-mathematics

### Accounts (11)

 Mathematics 523 rep 212 Cognitive Sciences 153 rep 3 Science Fiction & Fantasy 128 rep 2 Stack Overflow 123 rep 6 Physics 121 rep 4