Allowing more candidates results in a bizarre, yet possible popular vote differences for different numbers of candidates. Map data: OpenStreetMap contributors.
More from Chalkdust
In conversation with Shannon Trust
We find out more about the charity's work to support maths education in prisons.
Congruent Triangles
We review the seventh of this year’s nominees for the Book of the Year
In conversation with Martin Hairer
We talk to the Fields medallist about his life, his work and his advice to his younger self.
Page 3 model: The potato Earth
How Kelvin estimated the age of the Earth by thinking about a baked potato
Page 3 model: Woollen jumpers
How did your favourite sweater become so big? And how big can it get?
Significant figures: John Conway
The story of an unforgettable mathematician.