In mathematical finite group theory, the **vertex** of a representation of a finite group is a subgroup associated to it, that has a special representation called a **source**. Vertices and sources were introduced by Green (1958–1959)

## References

- Green, J. A. (1958–1959), "On the indecomposable representations of a finite group",
*Mathematische Zeitschrift*,**70**: 430–445, doi:10.1007/BF01558601, ISSN 0025-5874, MR 0131454

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