Norms of Minimal Projections

Details Norms of Minimal Projections Norms of Minimal Projections

1992-11-17

arxiv.org/abs/math/9211211v1

Mathematics

Functional Analysis

Scientific paper

It is proved that the projection constants of two- and three-dimensional spaces are bounded by $4/3$ and $(1+\sqrt 5)/2$, respectively. These bounds are attained precisely by the spaces whose unit balls are the regular hexagon and dodecahedron. In fact, a general inequality for the projection constant of a real or complex $n$-dimensional space is obtained and the question of equality therein is discussed.

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