2.6 Special names
Three kinds of conceptual graph are given distinguished names:
- A blank is an empty conceptual graph with no concepts, no
relations, and no arcs. This is a blank:
The blank conceptual graph is the graph that says nothing about
anything, and which therefore is true about everything.
- A singleton is a conceptual graph that consists of a single
concept, but no conceptual relations or arcs. We have already seen
an examle of a singleton:
- A star is a conceptual graph that consists of a single relation
and the concepts that are attached to its arcs. For example, these
are both stars:
"A bird is in a sycamore tree"
"A cat is on a mat"
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