• Closure (mathematics)
  Closure (mathematics)
  In mathematics, a set is said to be closed under some operation if performance of that operation on members of the set always produces a unique member of the same set. For example, the real numbers are closed under subtraction, but the natural numbers are not: 3 and 8 are both natural numbers, but...
  
  
• Closed manifold
  Closed manifold
  In mathematics, a closed manifold is a type of topological space, namely a compact manifold without boundary. In contexts where no boundary is possible, any compact manifold is a closed manifold....
  
  
• Closed orbits
• Closed set
  Closed set
  In geometry, topology, and related branches of mathematics, a closed set is a set whose complement is an open set. In a topological space, a closed set can be defined as a set which contains all its limit points...
  
  
• Closed differential form
  Closed and exact differential forms
  In mathematics, especially vector calculus and differential topology, a closed form is a differential form α whose exterior derivative is zero , and an exact form is a differential form that is the exterior derivative of another differential form β...
  
  
• Closed map
  Open and closed maps
  In topology, an open map is a function between two topological spaces which maps open sets to open sets. That is, a function f : X → Y is open if for any open set U in X, the image f is open in Y. Likewise, a closed map is a function which maps closed sets to closed sets...
  
  , a function that is closed.

• Cloister
  Cloister
  A cloister is a rectangular open space surrounded by covered walks or open galleries, with open arcades on the inner side, running along the walls of buildings and forming a quadrangle or garth...
  
  , a closed walkway
• Closed-circuit television
  Closed-circuit television
  Closed-circuit television is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors....
  
  
• Closed, an online community at the social web network Facebook
• Closing (real estate)
  Closing (real estate)
  Closing is the final step in executing a real estate transaction.The closing date is set during the negotiation phase, and is usually several weeks after the offer is formally accepted. On the closing date, the parties consummate the purchase contract, and ownership of the property is transferred...
  
  

See also

• Close (disambiguation) or closet
  Closet
  A closet is a small and enclosed space, a cabinet, or a cupboard in a house or building used for general storage or hanging clothes. A closet for food storage is usually referred to as a pantry...
  
  , similar spellings
• Open (disambiguation)