Review: Frédérique Longuet y Claude Springer, Autour du CECR Volume complémentaire (2018): médiation et collaboration. Une dialectique de la Relation écologique sociosémiotique (París, Édi-tions des archives contemporaines, 2021, 362 p. ISBN: 9782813004055. DOI: https://doi.org/-10.17184/eac.9782813004055).

the object of this paper to derive certain sucient condi-tions for close-to-convexity of certain analytic functions dened on theunit disk

There is grow ing ev id ence tha t in s titu tions m a tter for econom ic grow th . If good ins titu tions can s pur grow th , then try ing to change form al or externa l in s titu tions accord ingly a lm os t s eem s to s ugges t its elf. Yet, externa l in s titu tions w ill on ly provok e the d es ired effect if they are effectively en forced . It is a rgued tha t the effectivenes s of extern...

The notion of switching system generalizes the idea of a `diierential equa-tion': a switching system consists of a number of modes (e.g., diierential equations) together with a set of switching rules. Such systems arise in mod-eling thermostats (and other devices involving`hysteresis'), in considering the evolution of a multimodal (variable structure) system for which`feedback control' has been...