°_©l¸`ÂI¨ç¼Æ (InitialNodeFn)
A UnaryFunction that maps a
GraphArc to the initial node of the GraphArc. Note
that this is a partial function. In particular, the function is
undefined for GraphArcs that are not part of a DirectedGraph.
Ontology
SUMO / GRAPH-THEORYClass(es)
Coordinate term(s)
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Type restrictions
¹Ï¸`ÂI InitialNodeFn(¹Ï©·½u)
Axioms (4)
If graph ¬O ¦³¦V¹Ï ªº ¹ê¨Ò and arc ¬O ¹Ï©·½u ªº ¹ê¨Ò and arc ¬O graph ªº ³¡¤À, then there exist node1,node2 so that "arc ªº °_©l¸`ÂI" µ¥©ó node1 and "arc ªº ³Ì²×¸`ÂI" µ¥©ó node2.
(=>
(and
(instance ?GRAPH DirectedGraph)
(instance ?ARC GraphArc)
(graphPart ?ARC ?GRAPH))
(exists
(?NODE1 ?NODE2)
(and
(equal
(InitialNodeFn ?ARC)
?NODE1)
(equal
(TerminalNodeFn ?ARC)
?NODE2))))
- if graph ¬O ¹Ï¸ô®| ªº ¹ê¨Ò and arc ¬O ¹Ï©·½u ªº ¹ê¨Ò and arc ¬O graph ªº ³¡¤À,
- then if "arc ªº °_©l¸`ÂI" µ¥©ó node, then there doesn't exist other so that "other ªº °_©l¸`ÂI" µ¥©ó node and other µ¥©ó arc
.
(=>
(and
(instance ?GRAPH GraphPath)
(instance ?ARC GraphArc)
(graphPart ?ARC ?GRAPH))
(=>
(equal
(InitialNodeFn ?ARC)
?NODE)
(not
(exists
(?OTHER)
(and
(equal
(InitialNodeFn ?OTHER)
?NODE)
(not
(equal ?OTHER ?ARC)))))))
If "arc ªº °_©l¸`ÂI" µ¥©ó node and "arc ªº ³Ì²×¸`ÂI" µ¥©ó node, then arc ¬O ¹Ï°j°é ªº ¹ê¨Ò.
(=>
(and
(equal
(InitialNodeFn ?ARC)
?NODE)
(equal
(TerminalNodeFn ?ARC)
?NODE))
(instance ?ARC GraphLoop))
³Ìªì¸`ÂI¨ç¼Æ ¤º³¡¬ÛÃö©ó °_©l¸`ÂI¨ç¼Æ.
(relatedInternalConcept BeginNodeFn InitialNodeFn)