63.20 Adjacency

Adjacency( gamma, v )

This function returns (a copy of) the set of vertices of gamma adjacent to vertex v. A vertex w is adjacent to v if and only if [v,w] is an edge.

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

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