Example image of eyePlorer eyePlorer map for 'Clopen set': Closed set Open set Portmanteau Topological space Topology Empty set Interval (mathematics) Real line Subspace topology Connected space Boundary (topology) Rational number Locally connected space Discrete space Boolean algebra (structure) Intersection (set theory) Union (set theory) Stone's representation theorem for Boolean algebras Zero-dimensional space Identity component Lower limit topology Furstenberg's proof of the infinitude of primes Monadic Boolean algebra Cantor space Interior algebra Cylinder set Free Boolean algebra Subshift of finite type Clopen Determinacy Glossary of topology General frame Ideal (order theory) Distributive lattice Cantor set Topological property Finite topological space Boolean algebras canonically defined