2 papers
math.CO2013
Characterizations of 2-Colorable (Bipartite) and 3-Colorable Graphs
E. Sampathkumar, M. A. Sriraj
A \emph{directional labeling} of an edge in a graph by an ordered pair is a labeling of the edge such that the label on in the direction from $…
math.CO2013
Directionally 2-Signed and Bidirected Graphs
E. Sampathkumar, M. A. Sriraj, Thomas Zaslavsky
An edge uv in a graph Γ is directionally 2-signed (or, (2,d)-signed) by an ordered pair (a,b), a,b in {+,-}, if the label l(uv) = (a,b) from u to v, and l(vu) = (b,a) from v to u.…