63.42 DistanceSet

DistanceSet( gamma, distances, V )
DistanceSet( gamma, distances, V, G )

This function returns the set of vertices w of gamma, such that d(<V>,w) is in distances (a list or singleton distance).

The optional parameter G, if present, is assumed to be a subgroup of Aut(<gamma>) fixing V setwise. Including such a G can speed up the function.

    gap> DistanceSet( JohnsonGraph(4,2), 1, [1,6] );
    [ 2, 3, 4, 5 ] 

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