Example image of eyePlorer eyePlorer map for 'Open set': General topology Metric space Topological space Continuous function Topological indistinguishability Separation axiom Topology Algebraic geometry Algebraic variety Ball (mathematics) Differentiable manifold Differential topology Euclidean space Zariski topology Real number Category (mathematics) Morphism Isometry Metrization theorem Interior (topology) Countable set Gδ set Empty set Union (set theory) Intersection (set theory) Uniform space Rational number Complement (set theory) Clopen set Alexandrov topology Berezin transform Bloch space Borel set Carathéodory metric Cauchy–Riemann equations Characterizations of the category of topological spaces Chu space Closed set Coarea formula Compact complement topology Connected space Constant sheaf Domain (complex analysis) Either–or topology Excluded point topology Exterior (topology) Feebly compact space Grothendieck topology Gδ space Harmonic function