> Is it also the Guinness record holder for worlds shortest book?

336 pages covering Aristotle, Plotinus, Augustine, Aquinas, Leibniz:

* https://www.goodreads.com/book/show/35592365-five-proofs-of-...

205 (dense) pages going over Aquinas' Five Ways:

* https://www.goodreads.com/book/show/6963088-aquinas