# 使用

## 安装

To install OpenFOAM:

```console
(base) $ pip install openfoam -y
```

```C++
```



## 一个小例子

```{eval-rst}
.. function:: numpy.isFloat()
.. math::
   :nowrap:

   \begin{eqnarray}
      y    & = & ax^2 + bx + c \\
      f(x) & = & x^2 + 2xy + y^2
   \end{eqnarray}
   return a list of random something
```
## 拉普拉斯公式
```{eval-rst}
.. math::
   :nowrap:

   \begin{eqnarray}
      y    & = & ax^2 + bx + c \\
      f(x) & = & x^2 + 2xy + y^2
   \end{eqnarray}

   \[
       \frac{1}{4}
   \]

   $$
     \frac{\partial u}{\partial t} + c\frac{\partial u}{\partial x} = 0
   $$

.. math:: e^{i\pi} + 1 = 0
   :label: euler 
```

Since Pythagoras, we know that :math:`a^2 + b^2 = c^2`.

Euler's identity, equation {eq}`euler`, was elected one of the most
beautiful mathematical formulas.