Every vertex has an even degree, yet the picture cannot be drawn with a single stroke.
More from Chalkdust
Issue 16
Fields medals, iconic intersections, and things with silly names coming your way in our autumn 2022 issue! Plus all your favourite puzzles & columns.
Launch day puzzle hunt
Celebrate the launch of issue 11 by taking part in our puzzle hunt
Kepler’s barrels
Sam Hartburn orders wine by the barrel, but wonders if she's getting the most wine
Christmas competition #3: ‘An eggnog mystery’
Lies, liquor and logical deduction play their part in this festive holiday tale
You don’t need permission to be a great mathematician!
Nira Chamberlain, one of the UK's top 100 scientists, shares his experiences as a black mathematician.
Page 3 model
How to model bread making!