Graph neighbourhood
= Graph neighbourhood
{title2=$N(S)$}
= Neighbourhoods of a vertex
{synonym}
The neighbourhood $N(S)$ of a vertex set $S$ consists of all vertices adjacent to at least one vertex of $S$.
= Graph neighbourhood
{title2=$N(S)$}
= Neighbourhoods of a vertex
{synonym}
The neighbourhood $N(S)$ of a vertex set $S$ consists of all vertices adjacent to at least one vertex of $S$.