Markdown：插入数学公式

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[1]: http://latex.codecogs.com/gif.latex?\prod&space;n_{i}+1

![](http://latex.codecogs.com/gif.latex?a^{b})

$$TF(c_{i}^{j}) = \sigma_{i}^{j} \tag{1}$$

![](http://latex.codecogs.com/gif.latex?\sum_{i=0}^{n}a_{i}^{2}+b_{i}^{2})

![](http://latex.codecogs.com/gif.latex?\prod_{i=0}^{n}a_{i}^{2}+b_{i}^{2})

![](http://latex.codecogs.com/gif.latex?\frac{\partial^ny}{\partial&space;x^n}+a_{1}(x)\frac{\partial^{n-1}y}{\partial&space;x^{n-1}}+\cdots+a_{n-1}(x)\frac{dy}{dx}=f(x))

![](http://latex.codecogs.com/gif.latex?\int&space;\frac{dx}{\sqrt{1-x^{2}}}=arcsinx+c)

![](http://latex.codecogs.com/gif.latex?\begin{bmatrix}&space;a_{11}&space;&a_{12}&space;\\&space;a_{21}&space;&a_{22}&space;\\&space;a_{31}&space;&a_{32}&space;\end{bmatrix}\begin{bmatrix}&space;b_{11}&space;&b_{12}&space;&b_{13}&space;\\&space;b_{21}&space;&b_{22}&space;&b_{23}&space;\end{bmatrix}&space;=\begin{bmatrix}&space;a_{11}b_{11}+a_{12}b_{21}&a_{11}b_{12}+a_{12}b_{22}&space;&a_{11}b_{13}+a_{12}b_{23}&space;\\&space;a_{21}b_{11}+a_{22}b_{21}&a_{21}b_{12}+a_{22}b_{22}&space;&a_{21}b_{13}+a_{22}b_{23}&space;\\&space;a_{31}b_{11}+a_{32}b_{21}&a_{31}b_{12}+a_{32}b_{22}&space;&a_{31}b_{13}+a_{32}b_{23}&space;\end{bmatrix})