Author: Dmitry Orlov Author2: Alexander Vishik Author3: Vladimir Voevodsky Title: An exact sequence for Milnor's K-theory with applications to quadratic forms Email3: vladimir@ias.edu We construct a four-term exact sequence which provides information on the kernel and cokernel of the multiplication by a pure symbol in Milnor's K-theory mod 2 of fields of characteristic zero. As an application we establish, for fields of characteristics zero, the validity of three conjectures in the theory of quadratic forms - the Milnor conjecture on the structure of the Witt ring, the Khan-Rost-Sujatha conjecture and the J-filtration conjecture. The first version of this paper was written in the spring of 1996.