Ball (mathematics): Mathematics, Euclidean Space, Metric Space

Epsilon Neighborhood: Mathematics, Metric Space, Open Ball, Euclidean

Hilbert Metric: Mathematics, Metric (mathematics), Convex Set, Euclidean Space

Tree Graded Space: Metric Space, Mathematics, Distance, Euclidean

Totally Bounded Space: Mathematics, Topology, Relatively Compact, Complete Metric Space, Euclidean Distance