| | Cross-references: open, **interior**, open set, potential, theory, category, loop spaces, infinite-dimensional, varieties, algebraic, manifolds, finite-dimensional, smooth, homeomorphic, even, topological spaces, simplicial complexes, homotopy equivalent, homotopy, dimensions, order, cell attachment, discrete space, structure, attaching maps, subspace **topology**, intersection, closed, cells, weak **topology**, open cells, union, finite, closed cell, collection, subspaces, filtration, complex, Hausdorff topological space |