try latex
\(a=\lambda x.x\)
Hello!
\[ A = \begin{bmatrix} a_{11} & a_{12} & ... & a_{1n}\\ a_{21} & a_{22} & ... & a_{2n}\\ a_{31} & a_{22} & ... & a_{3n}\\ \vdots & \vdots & \ddots & \vdots\\ a_{n1} & a_{n2} & ... & a_{nn}\\ \end{bmatrix} , b = \begin{bmatrix} b_{1} \\ b_{2} \\ b_{3} \\ \vdots \\ b_{n} \\ \end{bmatrix} \]
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