Broere, Izak; Matsoha, Moroli D.V.; Heiema, Johannes
(De Gruyter Open, 2016)
A graph property is a set of (countable) graphs. A homomorphism from a
graph G to a graph H is an edge-preserving map from the vertex set of G into
the vertex set of H; if such a map exists, we write G → H. Given any ...