Keep a small equation readable

Use an inline expression within a sentence and a display expression when the equation needs its own line. Explain each symbol in nearby prose.

Inline example. $a^2 + b^2 = c^2$

$$
E = mc^2
$$

Check the rendered and exported copies

A plain Markdown file keeps the math source. Test the target renderer and exported PDF before relying on its presentation. Math support is not part of base CommonMark.