  It has been an open problem to find the Moore-Penrose inverses of the
incidence, Laplacian, and signless Laplacian matrices of families of graphs
except trees and unicyclic graphs. Since the inverse formulas for an odd
unicyclic graph and an even unicyclic graph are quite different, we consider
wheel graphs as they are formed from odd or even cycles. In this article solve
the open problem for wheel graphs. This work has an interesting connection to
inverses of circulant matrices.
