Banach spaces 57 Space and time 54 Hilbert space 50 Topology of spaces-- Manifold topology-- Metric topology 39 Mathematics 37 Topological Vector Spaces-- Linear topological spaces 34 Vector spaces 30 Space 29 Metric spaces 27 Function spaces 24 Topological Structures and spaces-- Knot theory-- Sheaf theory 24 Planetary and space science 23 Topology 23 Functional analysis 20 Topological spaces 19 Linear topological spaces 18 Physics 14 Space science 13 Public spaces 12 Sacred space 12 Space sciences 11 History 10 Linear operators 9 Operator theory 9 Science 9 Space science reviews 9 Cosmology 8 Space flight 8 Space law 8 Space perception 8