“…Given the conjunction of theses i) and ii), that is, that science represents the empirical phenomenon as "embedded" in certain abstract structures, on the one hand, and that abstract structures are described only by isomorphism, on the other, a question immediately arises: How can an abstract structure represent phenomena, that is, entities of a physical nature? The problem is not new and has been pointed out by several authors (Rosenhagen 2006;Barrett 2009;Turn 2009;Nguyen 2016;Ghins 2016). Van Fraassen, of course, is aware of it and expresses the difficulty in the following terms: How can an abstract entity, such as a mathematical structure, represent something that is not abstract, that is, something that is found in nature?…”