Hadwiger conjecture (combinatorial geometry)W
Hadwiger conjecture (combinatorial geometry)
Inscribed square problemW
Inscribed square problem
Kobon triangle problemW
Kobon triangle problem
Lebesgue's universal covering problemW
Lebesgue's universal covering problem
Resolution of singularitiesW
Resolution of singularities
Tripod packingW
Tripod packing
Unknotting problemW
Unknotting problem