Kernkonzepte
Graph Homomorphism is a C123-problem, distinguishing between polynomial-time solvability and hardness in the polynomial hierarchy.
Statistiken
Certain homomorphism problems do not fit in the framework.
The hard cases are ΠP2k-complete and the easy cases are in P.
Sequential 3-Colouring Construction Game is Pspace-complete on some class of bounded pathwidth.
Zitate
"Graph Homomorphism is a C123-problem."
"Locally Bijective, Surjective, and Injective Homomorphism are C23-problems."
"Sequential 3-Colouring Construction Game is Pspace-complete on bounded pathwidth."