The intersection lattice of a hyperplane arrangement $A$ is the lattice of intersections in the arrangement partially ordered by containment.



A theorem of Zaslavsky provides information about the topology of the complement of hyperplane arrangements over RR. In particular, the number of regions that $A$ divides RR into is derived from the moebiusFunction of the lattice. This can also be accessed with the realRegions method.


Furthermore, the number of these bounded regions can also be extracted from the moebiusFunction of the lattice; see also boundedRegions.

