MathDB
Putnam 2012 B2

Source:

December 3, 2012
Putnamgeometryinequalities3D geometrysphereprismUSAMTS

Problem Statement

Let PP be a given (non-degenerate) polyhedron. Prove that there is a constant c(P)>0c(P)>0 with the following property: If a collection of nn balls whose volumes sum to VV contains the entire surface of P,P, then n>c(P)/V2.n>c(P)/V^2.