Vertex of a representation
Encyclopedia
In mathematical finite group theory, the vertex of a representation of a finite group
Finite group
In mathematics and abstract algebra, a finite group is a group whose underlying set G has finitely many elements. During the twentieth century, mathematicians investigated certain aspects of the theory of finite groups in great depth, especially the local theory of finite groups, and the theory of...

is a subgroup associated to it, that has a special representation called a source. Vertices and sources were introduced by
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