A nickname given by MOSP
attendees to absurdly difficult geometry problems given to us by Zuming Feng
, one of the people who train our great nation's IMO
These problems typically consist of a mix among old IMO
problems, historically unsolved geometry problems, and infernally difficult problems created by Zuming himself. They are the bane of geometry-haters
An example of an "easy" problem follows:
Let ABC be a triangle. Suppose that the circle through C tangent to AB at A and the circle through B tangent to AC at A have different radii, and let D be their second intersection. Let E be the point on the ray AB such that AB = BE. Let F be the second intersection of the ray CA with the circle through A, D, E. Prove that AF = AC.
Nope, we didn't get a diagram either.
Problems like there are why geometry is evil