Dr. Israel Sigal

Israel Michael Sigal is one of Canada's most distinguished mathematicians. His most spectacular achievement has been his proof (with Soffer) of the asymptotic completeness of multiparticle systems. This work solved a fundamental problem in mathematical physics which had been studied by some of the world's leading mathematicians in both quantum mechanics and differential equations. Sigal's many other important contributions to mathematical physics include theoretical limits on the number of electrons a nucleus can bind, a theory of bound states in multiparticle systems, and the solution (with Ivrii) of a long open problem on the ground state energy of molecules.