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The lecture given in Beirut at Saint-Joseph University in four sessions in February and May 2005 focused on Europe and the Muslim world in the 19th  century. His starting point was the major break that occurred in the second half of the eighteenth …

Following on from last year's lecture, this year's lecture was devoted to the study of the chain of mathematical models enabling us to " go " from Atomic and Molecular Physics to Nonlinear Elasticity and the (macroscopic) mechanical properties of solids. …

In my lecture this year, I developed the relationship between the " Differential Geometry " and " Algebraic Geometry " aspects of non-commutative geometry, building on my collaboration with M. Dubois-Violette in which we classified non-commutative spheres …

This year's lecture was devoted to variations in processes that influence climate and whose causes are linked to phenomena outside the earth. Particular attention was paid to solar variability, from recent decades to several millennia. After reviewing …