Simply connected Alexandrov 4-manifolds with positive or nonnegative curvature and torus actions

We point out that a 4-dimensional topological manifold with an Alexandrov metric (of curvature bounded below) and with an effective, isometric action of the circle or the 2-torus is locally smooth. This observation implies that the topological and equivariant classifications of compact, simply connected Riemannian 4-manifolds with positive or nonnegative sectional curvature and an effective isometric action of a circle or a 2-torus also hold if we consider Alexandrov manifolds instead of Riemannian manifolds.Comment: 10 pages, title changed, results are now proved for Alexandrov 4-manifolds, added examples, simplified proof

Estudio sobre la colaboración inter-institucional en procesos de innovación pública

This article deepens on the role of inter-institutional collaboration in processes of public innovation, through the study of two cases: the first related to the management of patients with diabetic foot in a health sub-network, and the second about the administration of three municipal heated swimming pools. On the findings of this work five key points are identified to manage collaborative innovation processes. They are the following: (i) identify if it is required to innovate by collaborative work, (ii) have teams that address the challenges to solve, (iii) ensure compliance with minimum roles needed to manage collaborative innovation, (iv) promote collaborative spaces where the management of tacit knowledge is privileged over the explicit and (v) look for evidence of the results obtained from the solutions implemented.El presente artículo profundiza en el rol de la colaboración inter-institucional en procesos de innovación pública, a través del estudio de dos casos: el primero relacionado con la gestión de pacientes con pie diabético en una sub-red de salud, y el segundo en torno a la administración de tres piscinas municipales temperadas. Como conclusiones del trabajo se identifican cinco puntos claves para gestionar procesos colaborativos de innovación, los cuales son (i) identificar si se requiere innovar a través de un trabajo colaborativo, (ii) disponer de equipos de trabajo que aborden los desafíos a resolver, (iii) garantizar el cumplimiento de roles mínimos necesarios para gestionar la innovación colaborativa, (iv) promover espacios de colaboración donde se privilegie la gestión de conocimiento tácito por sobre el explícito, y (v) buscar evidencia de los resultados obtenidos a partir de las soluciones implementadas