
ray
End-Devouring Rays ★
Author(s): Georgakopoulos
Problem Let
be a graph,
a countable end of
, and
an infinite set of pairwise disjoint
-rays in
. Prove that there is a set
of pairwise disjoint
-rays that devours
such that the set of starting vertices of rays in
equals the set of starting vertices of rays in
.











