This document uses the principia package, which supports the Peanese logical notation of Volumes I to III of Whitehead and Russell's 1910 Principia Mathematica. The eight-page example is a list of definitions numbered in the book's style (for example *1·01), with symbols for implication, negation, descriptions and classes. It is built as a book with amsmath, amssymb, mathrsfs, enumitem and hyperref.
Shared under the LaTeX Project Public License 1.3c. All credit to Landon D. C. Elkind; the licence comes with the project's files.