Let h be an infinite dimensional complex hilbert space, b ( h ] the banach algebra of all bounded linear operators on h, and s ( h ) the space of all symmetric operators on h . let l be a real linear, weakly continuous rank one preserver of s ( h ) 設(shè)h是無限維復(fù)的hilbert空間,b(h)為h上的有界線性算子全體組成的banach代數(shù),s(h)為h上的對(duì)稱算子全體