Abstract: The p-widths of a closed Riemannian manifold are a nonlinear 
analogue of the spectrum of its Laplace--Beltrami operator, which was 
defined by Gromov in the 1980s and corresponds to areas of a certain 
min-max sequence of hypersurfaces. By a recent theorem of 
Liokumovich--Marques--Neves, the p-widths obey a Weyl law, just like 
the eigenvalues do. However, even though eigenvalues are explicitly 
computable for many manifolds, there had previously not been any >= 
2-dimensional manifold for which all the p-widths are known. In recent 
joint work with Otis Chodosh, we found all p-widths on the round 
2-sphere and thus the previously unknown Liokumovich--Marques--Neves 
Weyl law constant in dimension 2.