Willmore conjecture
Lower bound on the integrated squared mean curvature of a torus / From Wikipedia, the free encyclopedia
In differential geometry, the Willmore conjecture is a lower bound on the Willmore energy of a torus. It is named after the English mathematician Tom Willmore, who conjectured it in 1965.[2] A proof by Fernando Codá Marques and André Neves was announced in 2012 and published in 2014.[1][3]