61,389 Pages


Principia Mathematica was a book on mathematics by Bertrand Russell. Nyssa looked over a copy of Principia Mathematica while waiting for the Fifth Doctor to return to the TARDIS. Adric suggested that Tegan should read it, calling it a "fascinating book". (TV: Four to Doomsday)

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.