index.md

This is h1

This is h2

• Inline $...$: $N = \sum_{n=1}^r x_n$
• Inline \\(...\\): \(N = \sum_{n=1}^r x_n\)
• Inline + display style: $\displaystyle N = \sum_{n=1}^r x_n$

This is h3

This is h4

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From demo

When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$

Use $$...$$ (separate line)

$$ \int_{-\infty}^{\infty} f(t) e^{-j\omega t} dt $$

Use \\[...\\] (separate line)

\[ \int_{-\infty}^{\infty} f(t) e^{-j\omega t} dt \]