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A certain evening in Casablanca a man with a white jacket was sitting at Rick's bar. At the same time a man with a blonde woman was leaving Lisbon.
The first man is singled out as the one who stands in a specific relation to a given bar (that stands in a specific relation to Casablanca) in an s1 taken as the starting state of the story. The second one is singled out by his relation to a woman and to another city. The specification that the two relationships hold at the same time is enough to make us sure that we are dealing with two different individuals. Specifications of this kind characterize different kinds of narrativity: for instance, the roman-feuilleton gave a lot of incomplete descriptions which made a certain individual not immediately identifiable, later to provide the surprise of revealing that he is a well-known character of the story (topos of the 'false unknown').
The relation between Raoul and Marguerite or that between the man with the white jacket and Rick's bar is a dyadic and symmetric relation xRy where x cannot be without y, and vice versa.
However, this relation between the man in the white jacket, Rick's bar, and Casablanca is dyadic, transitive but not symmetric. The man and the bar are singled out by their mutual relation; the bar is also singled out by its being related to Casablanca. Transitively the man is identified also by his relation to Casablanca. But Casablanca, as an individual of W0 is not necessarily identified by its relation to the bar (or to the man). So we can say that we have symmetric relations holding between supernumeraries and nonsymmetric relations holding between a supernumerary and a variant of a prototype in W0. When there are complex intertwinings of relations, they are transitive.
I call these relations S-necessary or structurally necessary properties. They hold only within the framework of a fictional world and are the essential requisite for the identification of a supernumerary in any WN.
Once identified as the husband of Marguerite, Raoul can no longer be separated from his symmetrical counterpart. The story can very well assume later that he has divorced, but he remains the one who at s1 was the husband of Marguerite.
8.7.3. S-necessary and Essential Properties
Raoul is a man and Marguerite is a woman. These are essential properties, recognized also by the plot, and the fabula carries them on. S-necessary properties cannot deny essential ones since S-necessary properties are also semantically bound. This means that the relation of necessity holding between Raoul and Marguerite (rSm) appears in the fabula as semantically bound qua the relation of marriage (rMm). Were Marguerite a man, too, since (according at least to the meaning postulates

 
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