Test sequences for graphiness.
| is_graphical(sequence[, method]) | Returns True if sequence is a valid degree sequence. |
| is_digraphical(in_sequence, out_sequence) | Returns True if some directed graph can realize the in- and out-degree |
| is_multigraphical(sequence) | Returns True if some multigraph can realize the sequence. |
| is_pseudographical(sequence) | Returns True if some pseudograph can realize the sequence. |
| is_valid_degree_sequence_havel_hakimi(...) | Returns True if deg_sequence can be realized by a simple graph. |
| is_valid_degree_sequence_erdos_gallai(...) | Returns True if deg_sequence can be realized by a simple graph. |