If you are not only entering markdown in the Mardown editor, but also want to enter latex math formulas, you need to put latex math formulas in an HTML tag, such as <p></p> This avoids some characters in the mathematical formula being processed by the markdown engine.
For example, the following mathematical formula:
\begin{align}\notag \dot{x}&=\mathbf{a}x+\mathbf{b}u\y&=\begin{bmatrix}1&0\ 0&1\end{bmatrix}x+\begin{bmatrix}1&0\0&1\end{bmatrix}u\end{align}
In the Markdown editor, write this:
<p>\begin{align}\notag \dot{x}&=\mathbf{a}x+\mathbf{b}u\y&=\begin{bmatrix}1 &0\0&1\end{bmatrix}x+\begin{bmatrix}1&0\0&1\end{bmatrix}u\end{align}< /p>
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