The complexity of counting surjective homomorphisms and compactions
A homomorphism from a graph $G$ to a graph $H$ is a function from the vertices of $G$ to the vertices of $H$ that preserves edges. A homomorphism is surjective if it uses all of the vertices of $H$, and it is a compaction if it uses all of the vertices of $H$ and all of the nonloop edges of $H$. Hel...
| المؤلفون الرئيسيون: | , , |
|---|---|
| التنسيق: | Journal article |
| منشور في: |
Society for Industrial and Applied Mathematics
2019
|