The search session has expired. Please query the service again.

The search session has expired. Please query the service again.

The search session has expired. Please query the service again.

The search session has expired. Please query the service again.

Currently displaying 1 – 1 of 1

Showing per page

Order by Relevance | Title | Year of publication

Homomorphism duality for rooted oriented paths

Petra Smolíková — 2000

Commentationes Mathematicae Universitatis Carolinae

Let ( H , r ) be a fixed rooted digraph. The ( H , r ) -coloring problem is the problem of deciding for which rooted digraphs ( G , s ) there is a homomorphism f : G H which maps the vertex s to the vertex r . Let ( H , r ) be a rooted oriented path. In this case we characterize the nonexistence of such a homomorphism by the existence of a rooted oriented cycle ( C , q ) , which is homomorphic to ( G , s ) but not homomorphic to ( H , r ) . Such a property of the digraph ( H , r ) is called or * -. This extends the analogical result for unrooted oriented paths given in...

Page 1

Download Results (CSV)