Test different types of markdown compatible with gitHub.
bold
italics
$word^{upper script}$
$word_{lower script}$
In-line equations stay on the same line a the text $in-line\space equations$.
In-line equations ocupy separate line:
$$on-line equations$$
There is no need to use line break before or after on-line equation.
'vmatrix' command does not work with gitHub. $$ X = \begin{bmatrix} x_{1,1} & \ldots & x_{1,j} \\ \ldots & \ldots & \ldots \\ x_{n,1} & \ldots & x_{n,j}\\ \end{bmatrix} $$
This is an example link.
| A | B | C |
|---|---|---|
| a | b | c |
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