sandbox for markdown syntax/rendering

Table

cf. Markdown で表(テーブル)を描く - Qiita

Math

DON’T WORK in github pages

in line, $x^2 + y^2 = 1$

source

$x^2 + y^2 = 1$

by code block

S = - \frac{1}{2} \left[ X_\mu, X_\nu ]^2