102,096 research outputs found
Global Attractors of Non-autonomous Difference Equations
No full textThe article is devoted to the study of global attractors of quasi-linear non-autonomous difference equations, in particular we give the conditions for the existence of a compact global attractor. The obtained results are applied to the study of a triangular economic growth model recently developed by Brianzoni S., Mammana C. and Michetti E.Global attractors,Solow growth model,CGE,quasi-linear non-autonomous,difference equations,Endogenous population growth
A tetrahedron to model e-learning Mathematics
No full textIn this paper we introduce a model to 'read' the impact of e-learning technologies on the teaching/learning process, usually interpreted through the “didactical triangle” - knowledge, student, teacher (Chevallard, 1985). The idea we present here starts increasing the number of actors -that are author (A), student/s (S), tutor (T), mathematical knowledge (M) - and makes the model to become three-dimensional, passing from a triangle to a tetrahedron. The mediation of technology is represented by a sphere inscribed in the tetrahedron. The tangent point of the sphere with each face of the tetrahedron allows us to look at the relations among the three actors (the vertices of the face) in the e-learning environment and then how they can be transmitted /fostered/created by the new technological tools
Il varicocele essenziale: risultati preliminari della nostra esperienza e proposta di un nuovo criterio classificativo.
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