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Sigma KEE - Graph
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graph
The Class of graphs, where a graph is understood to be a set of GraphNodes connected by GraphArcs. Note that this Class includes only connected graphs, i.e. graphs in which there is a GraphPath between any two GraphNodes. Note too that every Graph is required to contain at least two GraphArcs and three GraphNodes.
Relationships      
Parents proposition Propositions are Abstract entities that express a complete thought or a set of such thoughts. As an example, the formula '(instance Yojo Cat)' expresses the Proposition that the entity named Yojo is an element of the Class of Cats. Note that propositions are not restricted to the content expressed by individual sentences of a Language. They may encompass the content expressed by theories, books, and even whole libraries. It is important to distinguish Propositions from the ContentBearingObjects that express them. A Proposition is a piece of information, e.g. that the cat is on the mat, but a ContentBearingObject is an Object that represents this information. A Proposition is an abstraction that may have multiple representations: strings, sounds, icons, etc. For example, the Proposition that the cat is on the mat is represented here as a string of graphical characters displayed on a monitor and/or printed on paper, but it can be represented by a sequence of sounds or by some non-latin alphabet or by some cryptographic form.
Children directed graphThe Class of directed graphs. A directed graph is a Graph in which all GraphArcs have direction, i.e. every GraphArc has an initial node (see InitialNodeFn) and a terminal node (see TerminalNodeFn).
 multi graphThe Class of multigraphs. A multigraph is a Graph containing at least one pair of GraphNodes that are connected by more than one GraphArc.
 pseudo graphThe Class of pseudographs. A pseudograph is a Graph containing at least one GraphLoop.


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