Characterizing Giry-algebras as coseparable super convex spaces

Abstract

We investigate the Eilenberg-Moore algebras for the Giry monad defined on the category of measurable spaces using super convex spaces. The category of super convex spaces has a subcategory consisting of the one point extension of the real line, and the truncated Yoneda embedding arising from the full subcategory with that one object is full, although it is not faithful. By restricting to those super convex spaces which are coseparable by the one point extension of the real line, the truncated Yoneda embedding is full and faithful. This permits the construction of a barycenter map used to factorize the Giry monad, and obtain an equivalence of categories.