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math.CO2023
Competition graphs of degree bounded digraphs
Hojin Chu, Suh-Ryung Kim
If each vertex of an acyclic digraph has indegree at most and outdegree at most , then it is called an digraph, which was introduced by Hefner~{\it et al.}~(1991). W…
math.CO2023
A digraph version of the Friendship Theorem
Myungho Choi, Hojin Chu, Suh-Ryung Kim
The Friendship Theorem states that if in a party any pair of persons has precisely one common friend, then there is always a person who is everybody's friend and the theorem has be…