# Category Books

## Double counting

Double counting is a simple yet so powerful way to prove non-trivial theorems. Here, we present some applications of the double counting principle. Our main source is the excellent book “Extremal Combinatorics” by Stasys Jukna [1]. A newer edition from the one in the picture (which shows the book I have) is also available now. […]

## Proclus and Math

Yesterday I received from Amazon the book of Terence Tao “Solving Mathematical Problems, a personal perspective”. In the preface I read the following interesting saying by the Greek Philosopher Proclus which I quote here: This therefore is Mathematics: She reminds you of the invisible forms of the soul; She gives life to her own discoveries; […]