INJECTIVE HULLS OF CERTAIN DISCRETE METRIC SPACES AND GROUPS
INJECTIVE HULLS OF CERTAIN DISCRETE METRIC SPACES AND GROUPS
Injective metric spaces, or absolute 1-Lipschitz retracts, share a number of properties with CAT(0) spaces. In the '60s Isbell showed that every metric space X has an injective hull E (X). Here it is proved that if X is the vertex set of a connected locally finite graph with a …