Abstract
We show that anagram-free vertex colouring a $2\times n$ square grid requires a number of colours that increases with $n$. This answers an open question in Wilson's thesis and shows that there are even graphs of pathwidth $2$ that do not have anagram-free colourings with a bounded number of colours.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have