This template is an example from the TUD-Script bundle for Technische Universität Dresden documents. It uses the tudscrartcl class with amsmath, and shows the same formula typeset in several variants of subscript and symbol styling, so you can see how the choices change spacing and weight. It is a one-page German example using fontspec and microtype. Replace the sample content with your own and compile to see the result.
Shared under the LaTeX Project Public License 1.3c. All credit to Falk Hanisch; the licence comes with the project's files.