Algebra Seminar talk
2009-10-30
Wilfried Imrich
Isovalente Mediangraphen mit zwei Enden (Two-ended regular median graphs)
Abstract:
It is shown that regular median graphs of linear growth are the
Cartesian product of finite hypercubes with the two-way infinite
path. Such graphs are Cayley graphs and have only two ends.
For cubic median graphs G the condition of linear growth can be weakened to the condition that G has two ends. For higher degree the relaxation to two-ended graphs is not possible, which we demonstrate by an example of a median graph of degree four that has two ends, but nonlinear growth.