Просмотр кода страницы Intersection graph

'''Intersection graph''' --- граф пересечений. 

The '''intersection graph''' of a set of items is a graph formed by associating each
item with a vertex and adding an edge between two vertices if the
associated items  have  a nonempty intersection.  The '''containment graph''' is formed in a similar fashion,  but there is an edge between two
vertices if one of the items contains the other.