Mathematics was the study of numbers.
Romulus and Remus Sylvest were mathematical geniuses. (TV: The Twin Dilemma [+]Anthony Steven, Doctor Who season 21 (BBC1, 1984).) Peter Hutchings was a professor of mathematics at the University of Cambridge. (PROSE: Timewyrm: Revelation [+]Paul Cornell, adapted from Total Eclipse, Virgin New Adventures (Virgin Books, 1991).) Danny Pink taught mathematics at Coal Hill School. (TV: Into the Dalek [+]Phil Ford and Steven Moffat, Doctor Who series 8 (BBC One, 2014).) Spending time in 1138 Essex, the Twelfth Doctor mentioned he'd provided the citizens with "top-notch maths tuition in a fun but relevant way", among other things. (TV: The Magician's Apprentice [+]Steven Moffat, Doctor Who series 9 (BBC One|BBC One]], 2015).) Before becoming a Renegade, the Master taught mathematics and computer science at the Prydonian Academy for a time. (PROSE: CIA File Extracts [+]J. Andrew Keith, The Doctor Who Role Playing Game supplements (FASA, 1986).)
Some of the companions of the Doctor studied or taught mathematics. Jackson Lake was a mathematics teacher. (TV: The Next Doctor [+]Russell T Davies, Doctor Who Christmas Special 2008 (BBC One, 2008).) Alistair Gordon Lethbridge-Stewart taught mathematics at Brendon Public School. (TV: Mawdryn Undead [+]Peter Grimwade, Doctor Who season 20 (BBC1, 1983).) Adric was awarded a gold star badge for mathematical excellence. (TV: Full Circle [+]Andrew Smith, Doctor Who season 18 (BBC1, 1980).) Zoe Heriot introduced herself to the Second Doctor and Jamie McCrimmon as "astrophysicist, pure mathematics major", to which her colleague, Dr Gemma Corwyn, added "with honours". (TV: The Wheel in Space [+]David Whitaker, Doctor Who season 5 (BBC1, 1968).)
In mathematics, i was an imaginary number that was the value of the square root of negative one. (AUDIO: Iterations of I [+]John Dorney, The Fifth Doctor Box Set (Big Finish Productions, 2014).)
51 was a pentagonal number. (TV: The Tsuranga Conundrum [+]Chris Chibnall, Doctor Who series 11 (BBC One, 2018).)
Any number that "reduce[d] to 1 when you take the sum of the square of its digits, and continue[d] iterating it until it yield[ed] 1," was a happy number. (TV: 42 [+]Chris Chibnall, Doctor Who series 3 (BBC One, 2007).)
Types of mathematics[]
An application of mathematics known as Block Transfer Computation could be used to create objects and alter spacetime. (TV: Logopolis [+]Christopher H. Bidmead, Doctor Who season 18 (BBC1, 1981).)
The Tenth Doctor mentioned recreational mathematics, which involved the study of happy prime numbers, numbers which are both happy and prime. He seemed surprised it wasn't a regularly studied course. (TV: 42 [+]Chris Chibnall, Doctor Who series 3 (BBC One, 2007).)