28:36IMO 2009 P5 - Best medium difficulty IMO functionShefs of Problem Solving1.2K viewsView & Download
16:12IMO 2013 P5 - A good medium level difficulty functional equation from the IMOShefs of Problem Solving885 viewsView & Download
15:56The Hardest Mathematics Problem Ever Asked on the IMOEllie Sleightholm212.5K viewsView & Download
9:52NICEST IMO Problem Ever? Ninja Says Yes! (IMO 2023 P5) #SoME3Nice Math Problems10.1K viewsView & Download
3:19[IMO Combinatorics] 2009 IMO shortlist using Invariants and MonovariantsDedekind cuts4.2K viewsView & Download