Solutions to Penrose's ‘Road To Reality’
Chapter 3: Kinds of number in the physical world

§3.2 The real-number system
3.1 * Continued fractions (I)
3.2 ** Continued fractions (II)
3.3 ** Eudoxos’ theory of proportions (I)
3.4 *** Eudoxos’ theory of proportions (II)