Abstract:A Gérard pour ses 2 6 et 2 6 +1-èmes anniversaires.Abstract This text has three parts. The first one is largely autobiographical, hence my use of the first person. There I recall how Gérard Cohen influenced important parts of my research.The second is of a more classic mathematical nature. I present a discrete analogue of the Hahn-Banach theorem, which serves as a basis for generalizing the notion of separating systems in the context of metric convexity.The third one aims at building a bridge between two commu… Show more
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