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In the mathematical field of graph theory, a core is a notion that describes behavior of a graph with respect to graph homomorphisms.

Definition

Graph $G$ is a core if every homomorphism $f:G\to G$ is an isomorphism, that is it is a bijection of vertices of $G$.

A core of a graph $H$ is a graph $G$ such that

1. There exists a homomorphism from $H$ to $G$,
2. there exists a homomorphism from $G$ to $H$, and
3. $G$ is minimal with this property.

Two graphs are said to be homomorphism equivalent or hom-equivalent if they have isomorphic cores.

Examples

• Any complete graph is a core.
• A cycle of odd length is its own core.
• Every two cycles of even length, and more generally every two bipartite graphs are hom-equivalent. The core of each of these graphs is the two-vertex complete graph K₂.

Properties

Every graph has a core, which is determined uniquely, up to isomorphism. The core of a graph G is always an induced subgraph of G. If $G\to H$ and $H\to G$ then the graphs $G$ and $H$ are necessarily hom-equivalent.

References

• Godsil, Chris, and Royle, Gordon. Algebraic Graph Theory. Graduate Texts in Mathematics, Vol. 207. Springer-Verlag, New York, 2001. Chapter 6 section 2.
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