analysis (differential/integral calculus, functional analysis, topology) metric space, normed vector space open ball, open subset, neighbourhood convergence, limit of a sequence compactness, sequential compactness … … topology (point-set topology, point-free topology) see also differential topology, algebraic topology, functional analysis and topological homotopy theory Basic concepts fiber space, space attachment Kolmogorov space, Hausdorff space, regular space, normal space sequentially...