Brother of a vertex

Brother of a vertex — брат вершины.

A brother of a vertex [math]\displaystyle{ v }[/math], denoted [math]\displaystyle{ \beta(v) }[/math], is a vertex in an oriented tree having the same father as [math]\displaystyle{ v }[/math] has.

Литература

• Евстигнеев В.А., Касьянов В.Н. Словарь по графам в информатике. — Новосибирск: Сибирское Научное Издательство, 2009.