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KB Term:
DirectedGraph
Sigma KEE  DirectedGraph
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directed graph
The
Class
of directed graphs. A directed graph is a
Graph
in which all
GraphArc
s have direction, i.e. every
GraphArc
has an initial node (see
InitialNodeFn
) and a terminal node (see
TerminalNodeFn
).
Relationships
Parents
graph
The
Class
of graphs, where a graph is understood to be a set of
GraphNode
s connected by
GraphArc
s. Note that this
Class
includes only connected graphs, i.e. graphs in which there is a
GraphPath
between any two
GraphNode
s. Note too that every
Graph
is required to contain at least two
GraphArc
s and three
GraphNode
s.
Children
graph path
Informally, a single, directed route between two
GraphNode
s in a
Graph
. Formally, a
DirectedGraph
that is a
subGraph
of the original
Graph
and such that no two
GraphArc
s in the
DirectedGraph
have the same initial node (see
InitialNodeFn
) or the same terminal node (see
TerminalNodeFn
).
tree
A Tree is a
DirectedGraph
that has no
GraphLoop
s.
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Sigma version 3.0 is
open source software
produced by
Articulate Software
and its partners