Summary
In this chapter, we prove (actually three times) von Neumann’s inequality and its extension (due to Ando) for two mutually commuting contractions. We discuss the case of n > 2 mutually commuting contractions. We introduce the notion of semi-invariance. Finally, we show that Hilbert spaces are the only Banach spaces satisfying von Neumann’s inequality.
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© 1996 Springer-Verlag Berlin Heidelberg
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Pisier, G. (1996). Von Neumann’s inequality and Ando’s generalization. In: Similarity Problems and Completely Bounded Maps. Lecture Notes in Mathematics, vol 1618. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-21537-1_2
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DOI: https://doi.org/10.1007/978-3-662-21537-1_2
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-60322-1
Online ISBN: 978-3-662-21537-1
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