Object Details Author Szpiro, George 1950- Contents Cannonballs and tomatoes -- The puzzle of the dozen spheres -- Fire hydrants and soccer players -- Thue's two attempts and Fejes-Tóth's achievement ...

A team led by mathematician Thomas Hales has delivered a formal proof of the Kepler Conjecture, which is the definitive resolution of a problem that had gone unsolved for more than 300 years.

Kepler read that particular treatise and admired it, having made his sunspot observations using a camera obscura in 1607 (published in a 1609 treatise), which he initially thought was a transit of ...