Mathematics is just the imposition of human cognitive structure on the world-as-it-is. Most mathematicians would disagree with this statement, since most are Platonists.
They would disagree with it because it is ontologically false. Mathematical systems are all either contradictory or logically incomplete. The world is not logically incomplete. It is also epistemologically false, since there are mathematical systems that do not confirm to, and cannot exist within, in the material universe.