A Generalization of Ando's Theorem and Parrott's Example

Details A Generalization of Ando's Theorem and Parrott's Example A Generalization of Ando's Theorem and Parrott's Example

2005-05-09

arxiv.org/abs/math/0505154v1

Mathematics

Operator Algebras

6 pages, accepted in PAMS

Scientific paper

Ando's theorem states that any pair of commuting contractions on a Hilbert space can be dilated to a pair of commuting unitaries. Parrott presented an example showing that an analogous result does not hold for a triple of pairwise commuting contractions. We generalize both of these results as follows. Any n-tuple of contractions that commute according to a graph without a cycle can be dilated to an n-tuple of unitaries that commute according to that graph. Conversely, if the graph contains a cycle, we construct a counterexample.

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