Ultrafilter in Digraph: Directed Tangle and Directed Ultrafilter
Takaaki Fujita · Journal of Advances in Mathematics and Computer Science · 2024
Tangle is a concept in graph theory that has a dual relationship with tree-width which is well-known graph width parameter. Ultrafilter is a fundamental notion in mathematics. In this concise paper, we will reconsider the relationship between Tangle and Ultrafilter in digraph.