120
Voted
EJC
2008
15 years 18 days ago
2008
It is known that every constraint-satisfaction problem (CSP) reduces, and is in fact polynomially equivalent, to a digraph coloring problem. By carefully analyzing the constructio...
124
Voted
DAGSTUHL
2008
15 years 2 months ago
2008
In a nutshell, a duality for a constraint satisfaction problem equates the existence of one homomorphism to the non-existence of other homomorphisms. In this survey paper, we give ...