The first test case is to create a matrix consisting of following elements
$$
\begin{matrix}
1 & x & x^2

1 & y & y^2

1 & z & z^2

\end{matrix}
$$

but all elemments of the matrix are displayed in one line. Fortunately, this can be solved by wraping the math expression inside a `<div> </div>`

block, which is hinted by the hugo documents of MathJax Support. besides, the blank line before `<div> </div>`

block is necessary, otherwise the matrix would not be displayed correctly.

Actually, what I would like to do is to display multi-line equations. Taking the example from the stackoverflow question Mathjax multi-line equation rendering issue, I input following MathJax expressions.

```
$$
\begin{eqnarray}
y &=& x^4 + 4 \nonumber \\
&=& (x^2+2)^2 -4x^2 \nonumber \\
&\le&(x^2+2)^2 \nonumber
\end{eqnarray}
$$
```

$$
\begin{eqnarray}
y &=& x^4 + 4 \nonumber

&=& (x^2+2)^2 -4x^2 \nonumber

&\le&(x^2+2)^2 \nonumber
\end{eqnarray}
$$

As you can see, the equations are displayed in one line. From the comments of the question, the solution is to use `\\\\\\`

instead of `\\`

as newline command, which also can be applied to the test example of matrix. But I think typing 6 `\`

is quite tedious. Is there any concise solution?

$$
\begin{eqnarray}
y &=& x^4 + 4 \nonumber \\

&=& (x^2+2)^2 -4x^2 \nonumber \\

&\le&(x^2+2)^2 \nonumber
\end{eqnarray}
$$

Alternative way to display matrix correctly is to use `\\\\\\`

instead of `\\`

as newline command.
$$
\begin{matrix}
1 & x & x^2 \\

1 & y & y^2 \\

1 & z & z^2 \\

\end{matrix}
$$