Referents are a complex subject area. Therefore, we will only give examples of some of the most important ones, and then refer more interested readers to the full material on referents. The full material is not required reading.
Recall that a concept has a type and a referent, separated by a colon:
In the following, we list some of the more important kinds of referents:
Finally, we will say a little about counts of sets used in referents.
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