³Ìªì¸`ÂI¨ç¼Æ (BeginNodeFn)
A UnaryFunction that maps a GraphPath
to the GraphNode that is the beginning of the GraphPath. Note that,
unlike InitialNodeFn (which relates a GraphArc to a GraphNode),
BeginNodeFn is a total function - every GraphPath has a beginning.
Ontology
SUMO / GRAPH-THEORYClass(es)
Coordinate term(s)
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Type restrictions
¹Ï¸`ÂI BeginNodeFn(¹Ï¸ô®|)
Axioms (3)
If graph ¬O ¹Ï ªº ¹ê¨Ò and node1 ¬O ¹Ï¸`ÂI ªº ¹ê¨Ò and node2 ¬O ¹Ï¸`ÂI ªº ¹ê¨Ò and node1 ¬O graph ªº ³¡¤À and node2 ¬O graph ªº ³¡¤À and node1 µ¥©ó node2, then there exist arc,path so that - arc (¨S) ³sµ²not(s) node1 ©M node2
or .
(=>
(and
(instance ?GRAPH Graph)
(instance ?NODE1 GraphNode)
(instance ?NODE2 GraphNode)
(graphPart ?NODE1 ?GRAPH)
(graphPart ?NODE2 ?GRAPH)
(not
(equal ?NODE1 ?NODE2)))
(exists
(?ARC ?PATH)
(or
(links ?NODE1 ?NODE2 ?ARC)
(and
(subGraph ?PATH ?GRAPH)
(instance ?PATH GraphPath)
(or
(and
(equal
(BeginNodeFn ?PATH)
?NODE1)
(equal
(EndNodeFn ?PATH)
?NODE2))
(and
(equal
(BeginNodeFn ?PATH)
?NODE2)
(equal
(EndNodeFn ?PATH)
?NODE1)))))))
graph ¬O ¹Ï§Î°j¸ô ªº ¹ê¨Ò if and only if there exists node so that "graph ªº ³Ìªì¸`ÂI" µ¥©ó node and "graph ªº ³Ì«á¸`ÂI" µ¥©ó node.
(<=>
(instance ?GRAPH GraphCircuit)
(exists
(?NODE)
(and
(equal
(BeginNodeFn ?GRAPH)
?NODE)
(equal
(EndNodeFn ?GRAPH)
?NODE))))
³Ìªì¸`ÂI¨ç¼Æ ¤º³¡¬ÛÃö©ó °_©l¸`ÂI¨ç¼Æ.
(relatedInternalConcept BeginNodeFn InitialNodeFn)