Vieri Benci

Vieri Benci (born May 9, 1949) is an Italian mathematician who worked at the University of Pisa. He has contributed to various fields of mathematics such as the partial differential equations (PDEs), mathematical physics, Hamiltonian dynamics, soliton theory, the geometry of general relativity, nonstandard analysis and the foundations of mathematics. In the latter two disciplines he introduced, in collaboration with M. Di Nasso and M. Forti, a theory of numerosity that refines the cantorian theory of cardinality; he has also worked on applications of nonstandard analysis to probability.