Math Example

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$$\mid \zeta -z-h\mid \ge \frac{1}{2}\mid \zeta -z\mid$$.

$$\frac{1}{\sqrt{2\pi }}\int \exp (-\frac{1}{2}{x}^2)dx=1$$

Inline math: $a=\frac{1}{\pi }$.

$$ℝ$$

$$\left[\begin{array}{cc}{\displaystyle \frac{\partial x_1}{\partial y_1}}& {\displaystyle \frac{\partial x_2}{\partial y_1}}\\ {\displaystyle \frac{\partial x_1}{\partial y_2}}& {\displaystyle \frac{\partial x_2}{\partial y_2}}\end{array}\right]$$