Circulant graphW
Circulant graph
Borsuk's conjectureW
Borsuk's conjecture
Hedetniemi's conjectureW
Hedetniemi's conjecture
Hirsch conjectureW
Hirsch conjecture
Keller's conjectureW
Keller's conjecture
Weaire–Phelan structureW
Weaire–Phelan structure
Mertens conjectureW
Mertens conjecture
Pólya conjectureW
Pólya conjecture
Hearing the shape of a drumW
Hearing the shape of a drum