| Sumario: | In this article we present the different formal definitions (and their operationalizations via the Pajek tool) of equivalent positions in a network by deconstructing them to identify the underlying sociological assumptions. Through pedagogical examples, we show their limits and the difficulties encountered by the user when it comes to choosing a particular method of analysis. With the RéSo tool, which emphasizes the link between individual trajectories and positions, we show the interest of keeping a discrete approach to identify more or less central or peripheral positions, in particular on the basis of an application in the framework of an associative environment.
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