👉 Hyperdulia is a mathematical concept in graph theory, specifically related to digraphs and hypergraphs. It refers to a type of digraph or hypergraph that has the property of being a perfect duality (a property which means it can be represented as the union of two other graphs). In other words, every vertex of the first graph is incident with exactly one vertex in the second graph, and vice versa. For example, consider a digraph with 3 vertices, where each vertex
