If the graph <gamma>, which must be simple, is bipartite, this function
returns a length 2 list of bicomponents or parts of <gamma>, otherwise
the empty list is returned.
*Note* If <gamma> is bipartite but not connected, then its set of
bicomponents is not uniquely determined.
Let <V> be a vertex or a nonempty list of vertices of <gamma>.
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.
Let <V> be a vertex or a nonempty list of vertices of <gamma>. This
function returns a list whose $i$-th element is the set of vertices of
<gamma> at distance $i-1$ from <V>.
The optional parameter <G>, if present, is assumed to be a subgroup of
$\Aut(<gamma>)$ which fixes <V> setwise. Including such a <G> can speed
up the function.
Returns a (hopefully large) independent set of the graph <gamma>, which
must be simple. An *independent set* of <gamma> is a set of vertices
of <gamma>, no two of which are joined by an edge. At present, a
greedy algorithm is used. The returned independent set will contain
the (assumed) independent set <indset> (default: `[]'), and not contain
any element of <forbidden> (default: `[]', in which case the returned
independent set is maximal).
An error is signalled if <indset> and <forbidden> have non-trivial
intersection.
See also "CompleteSubgraphs" and "CompleteSubgraphsOfGivenSize", which
can be used on the complement graph of <gamma> to look seriously for
independent sets.
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