This work contributes, on the one hand, to determine the didactic implications of an epistemological analysis on the generality of economic and analogous methods in the resolution of linear problems and, on the other hand, to build and evaluate a didactic sequence that makes it easier to understand by students the meaning of a unifying concept and help the spontaneous mobilization of its properties by exposure to a series of problems that use different mathematical frameworks (numerical, geometric, physical and analytical). The theoretical articulation concerns Modeling and the Duality process/object in the formation of the concept. We are inspired by a didactic engineering to present a part of the results of our research. These results refer to the levels of explanation and the skills developed in the use of technical skills and mathematical methods that help explain the process of notion formation.
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