Circular coloring

Circular coloring is a concept in graph theory, specifically in the area of graph coloring. Unlike traditional graph coloring, where vertices of a graph are colored such that no two adjacent vertices share the same color, circular coloring allows for a more flexible coloring scheme: instead of using discrete colors, it uses a continuous spectrum of colors represented on a circle. In circular coloring, each vertex is assigned a position on the circumference of a circle, which corresponds to a color on a continuous scale.