TeX

is a language for typesetting mathematical formulae. Observable provides a TeX tagged template literal implementation powered by . It is available by default as tex in Markdown, but you can also import it like so:

import tex from "npm:@observablehq/tex";

There are two ways to use TeX. The first is a tex fenced code block:

```tex
E = mc^2
```

This produces a centered block:

The second is an inline expression using the tex tagged template literal provided by the Observable standard library:

My favorite equation is ${tex`E = mc^2`}.

This produces:

My favorite equation is .

Here are some more examples.

c = \pm\sqrt{a^2 + b^2}

\Delta E^*_{00} = \sqrt{
  \Big(\frac{\Delta L'}{k_LS_L}\Big)^2 +
  \Big(\frac{\Delta C'}{k_CS_C}\Big)^2 +
  \Big(\frac{\Delta H'}{k_HS_H}\Big)^2 +
  R_T
  \frac{\Delta C'}{k_CS_C}
  \frac{\Delta H'}{k_HS_H}}

\def\f#1#2{#1f(#2)}
\f\relax{x} = \int_{-\infty}^\infty
    \f\hat\xi\,e^{2 \pi i \xi x}
    \,d\xi

For more, see the documentation website, in particular the list of supported functions.