4.1 Definitions for relations
This page merely gives an overview of the three kinds of ideas associated with relations, namely:
In later sections, we treat each idea more fully.
All relations have a relation type. This tells us the kind of relation we are dealing with. While concepts have both a type and a referent, relations only have a type.
The valence of a relation is the number of arcs that belong to it. This number, or the valence of a relation, is always greater than or equal to 1.
A relation type also has a signature. The signature of a relation is a list of the concept types involved in the relation.
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