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isSink -- determines if a vertex of a digraph is a sink or not



A vertex v of a Digraph D is a sink if v has no children

i1 : D = digraph({a,b,c,d,e},{{a,b},{b,c},{b,d},{e,b}});
i2 : isSink (D,b)

o2 = false
i3 : isSink (D,d)

o3 = true

See also

Ways to use isSink :

For the programmer

The object isSink is a method function.