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Remind me with party is the party of “family values” again?
The overlap is an empty set. It is still a set, but it has no elements in it
Eh, in this instance I disagree.
By showing the overlap and not including any states in the overlap, it draws extra attention to the point of diagram which is that there isn’t any overlap.
A Venn diagram does not imply that the intersection of the two sets is nonempty. It is merely a visual aid to illustrate the contents of two sets, and the center part is the intersection of those sets, which can be the empty set if the sets are disjoint (as they are in this context). The use of a Venn diagram is often used to show similarities and differences between two sets, but in this case the lack of any shared elements is actually the focal point of the diagram, used to illustrate a point. Showing disjoint sets disconnected from one another doesn't send merely as powerful of a message as showing disjoint sets in a Venn diagram, as the Venn diagram highlights the fact that they have no common elements. The reader is immediately drawn to the center of a Venn diagram when one is shown, and given that the center has no labels, it is a quick and effective way to illustrate that the sets are disjoint, especially when the reader notices how many labels exist in either set.
The essential point here is that the use of a Venn diagram does not imply shared members, it merely implies that sets are being compared.
Literally it's a thing:
A = {1, 3, 5}
B = {2, 4, 6}
A ∩ B = ∅
You seem to have skipped over the context in the Wikipedia page. That statement is true for an Euler diagram, not a Venn diagram. The next paragraph actually says outright that this is not the case for Venn diagrams. Here is that paragraph;
Note the "(even if such elements do not exist)".
You can find the Wikipedia page on Venn diagrams here, which further illustrates this point (I have linked to the section that starts off by detailing how all relationships between sets are shown in Venn diagrams, even if they are empty, which is in contrast to Euler diagrams)