In this research work, we have a didactical look on the integration of a computer tool into mathematics teaching: the spreadsheet. We have related research about spreadsheet to an instrumental approach perceived as essential to analyze the questions of technological integration. This approach allowed us to extend to this technology the theoretical framework of instrumentation. These theoretical...

This paper examines how Congress’s 2008 expansion of who is disabled under the Americans with Disabilities Act (ADA) impacts the labor market outcomes of newly covered individuals. Focusing on obese individuals, I exploit variation in coverage of obesity before and after the 2008 expansion to identify effects of the legal change, but I find no improvement in the labor market outcomes of the obe...

Let G be a reductive, connected algebraic group over an algebraic closure of a finite field. We define a tensor structure on the category of perverse sheaves on G which are direct sums of unipotent character sheaves in a fixed two-sided cell; we show that this is equivalent to the centre with a known monoidal abelian category (a categorification of the J-ring associated to the same two-sided ce...

During the FOS-DECAFE experiment at Lamto, Ivory Coast, in January 1991, various ground studies were undertaken simultaneously in order to investigate the physical and chemical characteristics of smoke emitted by savanna biomass burning. Here we present sunphotometer groundbased results which allow the measurements of the spectral optical depth between 450 and 850 nm, the atmospheric water vapo...

The dependence atom =(x, y) was introduced in [11]. Here x and y are finite sets of attributes (or variables) and the intuitive meaning of =(x, y) is that the attributes x completely (functionally) determine the attributes y. One may wonder, whether the dependence atom is truly an atom or whether it has further constituents. My very pleasant co-operation with Samson Abramsky led to the breaking...

The transition to chaos is ubiquitous in nonlinear systems ranging from fluid dynamics and superconducting circuits biological organisms. Optical driven out of equilibrium such as lasers supercontinuum generation exhibit chaotic states light with fluctuations both amplitude phase can give rise Levy statistics, turbulence rogue waves. Spatiotemporal also occurs continuous-wave-driven photonic-ch...