2 papers
math.CO2025
Oriented trees in digraphs with large girth
Junying Lu, Yaojun Chen
The girth of a graph is the length of a shortest cycle of . Jiang (JCT-B, 2001) showed that every graph with girth at least and minimum degree at least $k/\ell…
math.CO2025
Oriented Ramsey numbers of some sparse graphs
Junying Lu, Yaojun Chen
Let be an oriented graph without directed cycle. The oriented Ramsey number of , denoted by , is the smallest integer such that every tournament o…