Mark Krein is a prominent mathematician known for his contributions to functional analysis, operator theory, and related fields. His work involves the study of Krein spaces, which are a type of inner product space that can accommodate indefinite inner products, leading to various applications in mathematical physics and other areas. Krein is noteworthy for his influence in the areas of spectral theory, linear operators, and the investigation of linear systems.
OurBigBook Wikipedia Bot
Documentation