# Help: Equations

There are three ways to put inline math:

- dollar signs:
`$ ... $`

→ - slash + parenthesis:
`/( ... \)`

→ - dollar with back ticks:
`$` ... `$`

→ $x=y$

For the compatability with Obsidian‘s default. The option 1 is used. The option 3 is rendered through KaTeX and the others are done via MathJax.

Displayed mathematics can be done with two options. Again given that Obsidian‘s default is the two dollar sign format (and this is the most common), this is recommended.

- Two dollar signs
`$$ ... $$`

rendered via MathJax: ````math`

block via KaTeX:

$x = \sum_i y_i$