title: Constructibility
text: # Constructibility
  
  Constructibility or constructability may refer to:
  
  * Constructability or construction feasibility review, a process in construction design whereby plans are reviewed by others familiar with construction techniques and materials to assess whether the design is actually buildable
  * Constructible strategy game, a tabletop strategy game employing pieces assembled from components
  
  ## Mathematics
  
  * Compass-and-straightedge construction
  * Constructible point, a point in the Euclidean plane that can be constructed with compass and straightedge
  * Constructible number, a complex number associated to a constructible point
  * Constructible polygon, a regular polygon that can be constructed with compass and straightedge
  * Constructible sheaf, a certain kind of sheaf of abelian groups
  * Constructible set (topology), a finite union of locally closed sets
  * Constructible topology, a topology on the spectrum of a commutative ring y in which every closed set is the image of Spec(B) in Spec(A) for some algebra B over A
  * Constructible universe, Kurt Gödel's model L of set theory, constructed by transfinite recursion
  * Constructible function, a function whose values can be computed in a number of steps or a number of Turing-machine cells of order given by the function itself
  