Linear maps on factors which preserve the extreme points of the unit ball
Vania Mascioni, Lajos Molnar
Abstract
The aim of this paper is to characterize those linear maps from a von Neumann factor into itself which preserve the extreme points of the unit ball of . For example, we show that if is infinite, then every such linear preserver can be written as a fixed unitary operator times either a unital *-homomorphism or a unital *-antihomomorphism.
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