In purely infinite factors, P. de la Harpe proved that a normal subgroup of the unitary group which contains a non-trivial self-adjoint unitary contains all self-adjoint unitaries of the factor. Also he proved the same result in finite continuous factors. In a previous work the author proved a similar result in some types of unital AF-algebras. In this paper we extend the result of de la Harpe, concerning the purely infinite factors to a main example of purely infinite C*-algebras called the Cuntz algebras Script O signn(2 ≤ n ≤ ∞) and we prove that U(Script O signn) is normally generated by some non-trivial involution. In particular, in the Cuntz algebra Script O sign∞ we prove that U(Script O sign∞) is normally generated by self-adjoint unitary of odd type.
|Number of pages||7|
|Journal||Acta Mathematica Universitatis Comenianae|
|Publication status||Published - Jul 1 2008|
- Cuntz algebras
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