The fnspe package is intended mainly for students of FNSPE at CTU in Prague, although other students and scientists can use it too. It implements several standards of tensor notation, interval notation and complex notation, and adds many macros and shortcuts. This ten-page document explains the four categories of options, such as isointerval for the ISO 31-11 interval format, with examples and the differences between them.
Shared under the LaTeX Project Public License. All credit to Michal Zeman; the licence comes with the project's files.