Producción Científica Profesorado

2009

Itzá-Ortiz, B., Continuous and discrete flows on operator algebras, Journal of the Australian Mathematical Society 86 (2009), 169--176. Preprinted

**Abstract**

Let (N, R, ) be a centrally ergodic W* dynamical system. When N is not a factor, we show that, for each t 6= 0, the crossed product induced by the time t automorphism t is not a factor if and only if there exist a rational number r and an eigenvalue s of the restriction of to the center of N, such that rst = 2. In the C* setting, minimality seems to be the notion corresponding to central ergodicity. We show that if (A, R, ) is a minimal unital C* dynamical system and A is either prime or commutative but not simple, then, for each t 6= 0, the crossed product induced by the time t automorphism t is not simple if and only if there exist a rational number r and an eigenvalue s of the restriction of to the center of A, such that rst = 2.

CONTINUOUS AND DISCRETE FLOWS ON OPERATOR ALGEBRAS

Propagation of Elastic Waves along Interfaces in Layered Beams

PROPAGATION OF ELASTIC WAVES ALONG INTERFACES IN LAYERED BEAMS

Eigenfunction expansions and spectral projections for isotropic elasticity outside an obstacle

D-Branes in Orientifolds and Orbifolds and Kasparov KK-Theory

REALIZATION OF A SIMPLE HIGHER DIMENSIONAL NONCOMMUTATIVE TORUS AS A TRANSFORMATION GROUP C*-ALGEBRA

BlochFloquet waves and localisation within a heterogeneous waveguide with long cracks

Slow decay of end effects in layered structures with an imperfect interface

Una Conjetura de Polya y Szego para el Tono Fundamental de Membranas Poligonales