We modify slightly Voiculescu's definition of approximation entropy of automorphisms of finite von Neumann algebras and compare it with the entropy of Connes and Sto% rmer. For this the notion of a generator is relevant, as its existence implies that the entropies coincide. Special emphasis is put o
✦ LIBER ✦
Entropy of Endomorphisms and Relative Entropy in Finite von Neumann Algebras
✍ Scribed by Erling Størmer
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 186 KB
- Volume
- 171
- Category
- Article
- ISSN
- 0022-1236
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✦ Synopsis
We show the analogue for the entropy of automorphisms of finite von Neumann algebras of the classical formula H(T )=H( i=0 T &i P | i=1 T &i P), where T is a measure preserving transformation of a probability space, and P is a generator.
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Suppose b 1 , ..., b n are self-adjoint elements in a finite von Neumann algebra M with trace { and define a map 9 from M to complex (n+1)-space by the formula 9(x)=({(x), {(b 1 x), ..., {(b n x)). Next let B denote the image of the positive unit ball of M under the map 9. B is called the spectral s