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- J R Giol
- 2008

We demonstrate that the perforative phenomena shown to occur among simple amenable C∗-algebras by Villadsen and Toms can be realized within a dynamical framework. More specifically, we construct a minimal homeomorphism for which the K0 group of the crossed product fails to be weakly unperforated, and a minimal homeomorphism for which the crossed product has… (More)

- J R Giol, Leonid V. Kovalev, David A. Larson, JAMES E . TENER
- 2009

We investigate the topological and metric structure of the set of idempotent operators and projections which have prescribed diagonal entries with respect to a fixed orthonormal basis of a Hilbert space.

- J R Giol
- Revista odontológica de Puerto Rico
- 1971

- J R Giol
- Revista odontológica de Puerto Rico
- 1971

- J R Giol, Leonid V. Kovalev, +7 authors J. E. TENER
- 2011

We investigate the topological and metric structure of the set of idempotent operators and projections which have prescribed diagonal entries with respect to a Þxed orthonormal basis of a Hilbert space. As an application, we settle some cases of conjectures of Larson, Dykema, and Strawn on the connectedness of the set of unit-norm tight frames.

- J R Giol
- Revista odontológica de Puerto Rico
- 1985

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