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1. CMB 1998 (vol 41 pp. 434)

Mascioni, Vania; Molnár, Lajos
 Linear maps on factors which preserve the extreme points of the unit ball The aim of this paper is to characterize those linear maps from a von~Neumann factor $\A$ into itself which preserve the extreme points of the unit ball of $\A$. For example, we show that if $\A$ is infinite, then every such linear preserver can be written as a fixed unitary operator times either a unital $\ast$-homomorphism or a unital $\ast$-antihomomorphism. Categories:47B49, 47D25
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