| The Algebra of Ice | |
| Author: | Lloyd Rose |
| Series: | Doctor Who book: Past Doctor Adventures |
| Release Number: | 68 |
| Subject: | Featuring: Seventh Doctor Ace |
| Set In: | Period between Loving the Alien and Atom Bomb Blues |
| Release Date: | September 2004 |
| Publisher: | BBC Books |
| Pages: | 279 |
| Isbn: | 0-563-48621-X |
| Preceded By: | Synthespians™ |
| Followed By: | The Indestructible Man |
The Algebra of Ice is a BBC Books original novel written by Lloyd Rose and based on the long-running British science fiction television series Doctor Who. It features the Seventh Doctor and Ace.
The Doctor and Ace investigate a 'crop circle' in the Kentish countryside; they are helped by a maths expert, a web-magazine publish and the Doctor's friend, the Brigadier. However, this crop circle is made of ice and is not circular, instead being filled with square-sided shapes. It draws the Doctor and Ace into a new level of reality.
The story makes reference to the Riemann hypothesis, featuring a sequence set in a 'world' modelled on the Riemann zeta function.