P 4-Reduced graph

[math]\displaystyle{ P_{4} }[/math]-Reduced graph --- [math]\displaystyle{ P_{4} }[/math]-сводимый граф.

This class was introduced by Jamison and Olariu (1989) as the class of graphs for which no vertex belongs to more than one induced [math]\displaystyle{ P_{4} }[/math]. See [math]\displaystyle{ P_{4} }[/math]-sparse graphs.