Lemma
DeepPigeonhole
#56 · Combinatorics · Pigeonhole

Five points in a square

Five points are placed inside a 1×1 square. Prove that some two of them are at distance at most apart.

~12 minWritten answer · compare with the solutionPigeonholeDistances in a square
Stuck? A gentle nudge
Something off?
Workspace
Your working

Check your full solution

Upload photos of your handwritten work or a PDF, and Lemma will read it and tell you whether it's right — and where it first goes wrong if not.