测试

public class{
    public static void main(String[] args){

        System.out.println("Hello");

    }
}
f(x) = \int_{-\infty}^\infty  \hat f(x)\xi\,e^{2 \pi i \xi x}  \,\mathrm{d}\xi 
\begin{array}{c} 
  a,b \in R^{+} \\  
  \Rightarrow \frac{a+b}{{2}}\ge \sqrt{ab} \\  
  \left( \text{当且仅当}a=b\text{时取“}=\text{”号}\right) 
\end{array}
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2 Responses to 测试

  1. 路人甲 says:

    这是一个测试内容

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